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Undergarments

Control your climate with Bontrager baselayers.

Available in multiple fabric weights, each with its own unique construction, and each designed for moisture-wicking, quick-drying, and 4-way stretch mobility, Bontrager baselayers provide the specific thermal performance you need to stay comfortable, no matter how intense your ride or varied the conditions.

Fox Racing Baseframe Pro Short Sleeve Base Layer
$189.95
Low-profile sleeveless baselayer guard The Baseframe Pro Short Sleeve is a breathable baselayer with built in guards on the shoulder. It's designed to be worn under your jersey for low-profile coverage. It includes a removeable back insert, increasing your impact protection, while the fabric wicks away sweat as you ride and keeps you cool. The Baseframe Pro will fit snug and secure—the polymer softens to conform to your body as it is warmed by your own heat—offering minimal restrictions and maximum benefit. The more you ride, the better it feels. - Exceeds EN1621-1 level 1 back certification including high and low temperature conditions - Removable CE certified D3O Viper back insert features world leading impact protection technology - Large perforation and flex grooves in the back foam contours and flexes with rider movement - EN1621-1 Level 1 D3O shoulder inserts for additional protection - Body heat activates (softens) the polymer to conform to body - Moisture wicking, open stretch mesh for breathability CERTIFICATIONS - Exceeds EN1621-1 level 1 back certification - EN1621-1 level 1 shoulder inserts for additional protection
Fox Racing Baseframe Pro Sleeveless Guard
$169.95
Moisture-Wicking Baselayer with Integrated Back and Hip Guards The Baseframe Pro Sleeveless base layer provides moisture management, cooling, and protection in a single low-profile unit. Designed to be worn under your jersey, it provides EN1621-1 Level 1 back protection. Hip pads provide additional protection. Features - EN1621-1 Level 1 Back including high and low-temperature conditions - CE Certified D3O back insert world-leading impact protection technology - Large perforation and flex grooves in the back foam contours and flexes with rider movement - Body heat activates (softens) the polymer to conform to body - Moisture-wicking, open stretch mesh for breathability - Built-in padding at hips offers additional comfort - D3O back insert is removable for easy washing Construction - 35% PU / 37% nylon / 8% polyester / 20% Eva
7iDP Flex Youth Body Protector
$114.99
The Flex Suit offers customizable shoulder protection with the option to carry a water bladder in place of the spine protector. All the pockets you need on the trails in easy access positions and a compression fit that can be worn under a jersey.  Two angled pockets on each hip mean easy access to trails snacks, multi-tools, and a mobile phone. The larger central pocket is designed for larger items like a spare tube or a small packable jacket.
Pearl Izumi Men's Merino Thermal Long Sleeve Baselayer
$110.00
This is our heaviest base layer, at 250g/m2. It combines our 18.5-micron responsibly sourced Merino and recycled polyester technical fibers in a remarkable construction that positions the polyester next to your skin for maximum wicking while the wool faces out for superior insulation. With its long sleeves it is the ideal garment to layer beneath one of our AmFIB jackets. Thumb loops keep the sleeves in place as you pull on your jersey. - Mid-weight Transfer Merino fabric combines wool and recycled polyester for sustainable technical performance. - Unique plated fabric construction places polyester next to skin and merino on the exterior for superior moisture transfer and thermal regulation. - Made using fine 18.5-micron merino wool for superior comfort. - Recycled Repreve XS Polyester technical fibers are made from recycled plastic water bottles. - Set in sleeve construction for easy layering and versatility.
Pearl Izumi Women's Merino Thermal Long Sleeve Baselayer
$110.00
This is our heaviest base layer, at 250g/m2. It combines our 18.5-micron responsibly sourced Merino and recycled polyester technical fibers in a remarkable construction that positions the polyester next to your skin for maximum wicking while the wool faces out for superior insulation. With its long sleeves it is the ideal garment to layer beneath one of our AmFIB jackets. Thumb loops keep the sleeves in place as you pull on your jersey. - Mid-weight Transfer Merino fabric combines wool and recycled polyester for sustainable technical performance. - Unique plated fabric construction places polyester next to skin and merino on the exterior for superior moisture transfer and thermal regulation. - Made using fine 18.5-micron merino wool for superior comfort. - Recycled Repreve XS Polyester technical fibers are made from recycled plastic water bottles. - Set in sleeve construction for easy layering and versatility.
Race Face Flank Liner Shorts
$106.00
- Removable D30 high-performance shock absorbing protective foam at hips - Butterfly mesh throughout ensures a second skin fit to keep targeted hip protection in place - Highly durable mesh panels at inner thigh ensure maximum venting - Custom heat-moulded foam at outer thighs offers additional protection against knocks and bumps - Flatlock seam finish ensures mobility and comfort through the rider's full range of motion - High performance, Italian-made chamois with triple-density foam, rapid sweat absorption technology, anti-bacterial properties, and Eschler top fabric - Soft brushed Boxer Style elastic waistband - Custom elastic leg hem holds the short in place - Inner lower leg opening features 'slip panel' designed to glide over protection
Pearl Izumi Men's Cargo Bib Liner Shorts
$100.00
Many experienced riders have opted for the comfort of road bibs under shell shorts for years. They prefer the feel of a bib, but road shorts are not made to be covered with a durable shell short, and the combination can be warmer than ideal. Enter Pearl Izumi's Cargo Bib Liner Short, which not only improves ventilation versus traditional road shorts, but also adds integrated storage with three rear jersey-type pockets and two lower pockets on the thigh for trail essentials, like water, tools, and spare tubes. The superior ELITE Escape 1:1 Chamois takes saddle comfort to a whole new level. With this ultimate bib liner you can ditch your hydration pack for all but your longest rides. Features: - New Transfer Mesh body fabric provides an amazing next-to-skin feel - Smooth fabric across the front of the legs slides easily under shell shorts and ensures a friction-free pedaling experience - Optimized with superior ELITE Escape 1:1 Chamois - Three pockets on the lower back of the bib, and two thigh pockets for carrying ride essentials - 10” inseam
G-Form Pro-X3 Bike Short Liner
$99.99
These body-mapped, impact-absorbing SmartFlex pads offer form-fitting and lightweight protection that is flexible as you ride and hardens on impact. - Ventilated SmartFlex hip pads allow airflow to keep wearer dry and comfortable - 4+ hour chamois to remain chafe-free - Moisture-wicking, UPF 50+ compression fabric - Side leg pocket - Machine washable - CE PPE II—15613 Impact Attenuation / 1621-1 coverage
G-Form Women's Pro-X3 Bike Short Liner
$99.99
- Body-mapped, impact-absorbing SmartFlex pads offer form-fitting and lightweight protection that is flexible as you ride and hardens on impact - Ventilated SmartFlex hip pads allow airflow to keep wearer dry and comfortable - 4+ hour chamois to remain chafe-free (Not included on youth) - Moisture-wicking, UPF 50+ compression fabric - Side leg pocket - Women's short liner has high waist, yoga-style waistband, and longer inseam for a more comfortable fit - Machine washable - CE PPE II—15613 Impact Attenuation / 1621-1 coverage
Pearl Izumi Men's Merino Long Sleeve Baselayer
$90.00
This highly technical base layer delivers true sustainable performance. The key to staying comfortable on cold days is staying dry. We used a construction method called plating to place recycled polyester technical fibers next to skin on our responsibly sourced Merino wool, long-sleeve base layer. By putting polyester next to the rider’s skin, it transports moisture away to the Merino layer where it can evaporate even as the wool acts as insulation. The base layer uses a set-in sleeve design for a versatile form-following fit to make layering easy. - Transfer Merino fabric combines wool and recycled polyester for sustainable technical performance. - Unique plated fabric construction places polyester next to skin and merino on the exterior for superior moisture transfer and thermal regulation. - Made using fine 18.5-micron merino wool for superior comfort. - Recycled Repreve XS Polyester technical fibers are made from recycled plastic water bottles. - Set in sleeve construction for easy layering and versatility. - Wool Blend Performance certified by the Woolmark Company to ensure the highest quality product.
Pearl Izumi Women's Merino Long Sleeve Baselayer
$90.00
The key to staying comfortable on cold days is staying dry. We used a construction method called plating to place recycled polyester technical fibers next to skin on our responsibly sourced Merino wool, long-sleeve base layer. By putting polyester next to the rider's skin, it transports moisture away to the Merino layer where it can evaporate even as the wool acts as insulation. The base layer uses a set-in sleeve design for a versatile form-following fit to make layering easy. - Transfer Merino fabric combines wool and recycled polyester for sustainable technical performance. - Unique plated fabric construction places polyester next to skin and merino on the exterior for superior moisture transfer and thermal regulation. - Made using fine 18.5-micron merino wool for superior comfort. - Recycled Repreve XS Polyester technical fibers are made from recycled plastic water bottles. - Set in sleeve construction for easy layering and versatility. - Wool Blend Performance certified by the Woolmark Company to ensure the highest quality product.
Castelli Prosecco Tech W Long Sleeve
$89.99
The first goal of this base layer is to move moisture away from your skin while adding minimal insulation for those cool days when your riding intensity is high enough and your outer layers are warm enough. The areas covered by the bibtight around the waist and up the back can get hot, so we used a lightweight PrimaLoft fabric to help even out the temperature. This baselayer works best when in contact with the skin, so both fabrics are very stretchy and the cut is slim. On extremely cold days we'll use this as a first layer under a Flanders Warm second base layer, or under a thermal jersey. It's very effective at moving sweat away from the body. - Proprietary stretch rib knit 100% polyester main body fabric with Prosecco hydrophilic treatment for maximum wicking - PrimaLoft panels at waist and back where bibtight covers the upper body, to reduce uneven insulation - Crew neck closure to fit under short-collared jerseys
Gore Wear M GORE WINDSTOPPER Base Layer Shirt
$80.00
For cool to cold days, the addition of a GORE WINDSTOPPER base layer to your normal clothing set up will keep you warmer without adding bulky layers. Keeping sweat off your skin will keep you cool on the way up & prevent wind chill on the way down. - Extra-long back - GORE WINDSTOPPER insert on front, over shoulders and on kidney area - GORE WINDSTOPPER Technology: windproof, water resistant, highly breathable - Quick dry - Next-to-skin comfort - Minimized seams - Thin and soft fabric - Reflective logo on front - Flat-lock seams
Gore Wear M Women GORE WINDSTOPPER Base Layer Shirt
$80.00
For cool to cold days, the addition of a GORE WINDSTOPPER base layer to your normal clothing set up will keep you warmer without adding bulky layers. Keeping sweat off your skin will keep you cool on the way up & prevent wind chill on the way down.
Pearl Izumi Men's Merino Baselayer
$80.00
This highly technical base layer delivers true sustainable performance. You've never worn a Merino base layer like this. We use a unique fabric construction method to place polyester fibers against your skin to improve wicking, and Merino facing the jersey for temperature regulation and odor control. The 18.5-micron Merino is responsibly sourced while the polyester is spun from recycled water bottles. The polyester also increases the base layer’s durability. The short sleeves feature a set-in construction for a versatile next-to-skin form fit. - Transfer Merino fabric combines wool and recycled polyester for sustainable technical performance. - Unique plated fabric construction places polyester next to skin and merino on the exterior for superior moisture transfer and thermal regulation. - Made using fine 18.5-micron merino wool for superior comfort. - Recycled Repreve XS Polyester technical fibers are made from recycled plastic water bottles. - Set in sleeve construction for easy layering and versatility. - Wool Blend Performance certified by the Woolmark Company to ensure the highest quality product.
Pearl Izumi Women's Merino Baselayer
$80.00
You’ve never worn a Merino base layer like this. We use a unique fabric construction method to place polyester fibers against your skin to improve wicking and Merino facing the jersey for temperature regulation and odor control. The 18.5-micron Merino is responsibly sourced while the polyester is spun from recycled water bottles. The polyester also increases the base layer’s durability. The short sleeves feature a set-in construction for a versatile next-to-skin form fit. - Transfer Merino fabric combines wool and recycled polyester for sustainable technical performance. - Unique plated fabric construction places polyester next to skin and merino on the exterior for superior moisture transfer and thermal regulation. - Made using fine 18.5-micron merino wool for superior comfort. - Recycled Repreve XS Polyester technical fibers are made from recycled plastic water bottles. - Set in sleeve construction for easy layering and versatility. - Wool Blend Performance certified by the Woolmark Company to ensure the highest quality product.
Castelli Core Seamless Base Layer LS
$79.98
Time to give seamless base layers another try. Seamless construction promises stretch and comfort, but most base layers on the market have a nylon and Lycra mix that feels comfortable when you put it on but then ends up feeling wet when you're actually riding, and you freeze when you stop. We've worked hard to make this Core Seamless base layer keep you warm and dry, thanks to the addition of polypropylene and polyester yarns, while not compromising the stretch comfort of seamless. We think we've found the sweet spot that also provides a nice level of warmth for cool to cold days. - 84% polyester / 16% polypropylene yarns provide soft, warm wicking and exceptional stretch fit - Seamless construction means extra comfort - Lighter weight on side and back - Wide neck opening to fit under short-collared jerseys
Terry Terry Performance Liner
$79.95
The Terry Performance Short Liner is designed for more serious cycling uses. Outfitted with the premium Flex Air chamois and made of mesh, it's a great option to pair up with any bottom. - 75% nylon/25% spandex mesh - 1 3/4 inch soft, debossed elastic at waist and legs - flat-seam construction reduces the potential for chafing -  silicone chain grip on inside leg bands adheres without binding - Flex Air Chamois with soft wing technology & perforated foam for breathability - 6.75 inch inseam - Breathable - Moisture Wicking
Craft Active Extreme 2.0 CN SS
$74.99
- Thin, lightweight and elastic fabric that is channel-knitted to trap air and provide warmth - Coolmax-Air fiber against the skin enhances cooling and moisture transport - Body mapped mesh for optimal temperature regulation - Flatlock seams that follow body movements - Fabric 1: 100% Polyester - Fabric 2: 96% Polyester, 4% Elastane
G-Form Youth Pro-X3 Bike Short Liner
$74.99
- Body-mapped, impact-absorbing SmartFlex pads offer form-fitting and lightweight protection that is flexible as you ride and hardens on impact - Ventilated SmartFlex hip pads allow airflow to keep wearer dry and comfortable - Moisture-wicking, UPF 50+ compression fabric - Side leg pocket - Machine washable - CE PPE II—15613 Impact Attenuation / 1621-1 coverage
Race Face Stash Storage Short Liner
$72.00
The STASH collection was developed for the growing number of riders trending away from using full hydration packs (especially on shorter rides) but still wanting the convenience of carrying items in a secured, balanced location. This new category offers a combination of storage core layers: tank, liner and bib. STASH gives riders the option to carry a bladder, spare tube, tool, pump, snacks, etc without having to wear a traditional pocketed XC jersey. - Butterfly Mesh liner - Mesh panels welded along outer legs - TMF Italian-made chamois with anti-bacterial technology - Soft brushed elastic waistband - Zippered STASH pocket below back waistband at lumbar - Fuel storage pockets hide gel packs at left and right thigh for easy access while pedalling - Silicone gripper at leg cuff opening
Pearl Izumi Men's Cargo Liner Shorts
$70.00
Engineered to deliver friction free pedaling, performance, and phenomenal breathability, the Pearl Izumi Men's Cargo Liner Shorts are a must have for serious trail riders. Smooth fabric on the front of the thighs allows the liner to slide easily beneath your shell shorts and the Transfer Mesh main body delivers unbelievable breathability. Thigh pockets near the leg openings can conveniently stash your food, ID, money, or tools. And they are easy to access by flipping up the bottom of your shell short. The superior ELITE Escape 1:1 Chamois takes your saddle comfort to a whole new level. Features: - New Transfer Mesh body fabric provides an amazing next-to-skin feel - Smooth fabric across the front of the legs slides easily under shell shorts and ensures a friction-free pedaling experience - Optimized with the superior ELITE Escape 1:1 Chamois - Two thigh pockets for carrying ride essentials - 10” inseam
Pearl Izumi Women's Cargo Liner Shorts
$70.00
Engineered to deliver friction free pedaling, performance, and phenomenal breathability, the Pearl Izumi Women's Cargo Liner Shorts are a must have for serious trail riders. Smooth fabric on the front of the thighs allows the liner to slide easily beneath your shell shorts and the Transfer Mesh main body delivers unbelievable breathability. Thigh pockets near the leg openings can conveniently stash your food, ID, money, or tools. And, they are easy to access by flipping up the bottom of your shell short. The superior W ELITE Escape 1:1 Chamois takes your saddle comfort to a whole new level. Features: - New Transfer Mesh body fabric provides an amazing next-to-skin feel - Smooth fabric across the front of legs slides easily under shell shorts, providing a friction-free pedaling experience - Optimized with the superior W ELITE Escape 1:1 Chamois - Two thigh pockets for carrying ride essentials - 8” inseam
Fox Racing Tecbase Liner Shorts
$69.95
The Most Essential Part of Your Ride The Tecbase Liner Short is an essential piece of riding gear. The dual-density EVO chamois provides excellent comfort on any ride. The lightweight 4-way stretch mesh keeps the air moving, and flatlock seams ensure all-day comfort on the toughest rides. Features - Dual-density EVO Chamois for increased comfort in the saddle - Silicone thigh grippers prevent ride-up - Lightweight 4-Way stretch mesh provides all-day comfort - Flat-locked seams are low-profile for extra comfort - Jacquard fox elastic waistband - Inseam: 8.25" Construction - 80% polyamide nylon / 20% elastane
Fox Racing Women's Tecbase Liner Short
$69.95
The most essential part of your ride.
Bellwether Women's Premium Mesh Undershorts
$65.00
High-density, quick-drying chamois combined with highly ventilated moisture managing fabrics designed to be worn under trail short Features - Techmesh™ inner short with premium chamois - Ergonomic form fitting panel design - Soft front waistband improves comfort - Flat stitch construction - Externally sewn silicone leg gripper Inseam: 7 1/2” (Size Medium) Fabric: Techmesh™ Chamois: Contour Pro™
Pearl Izumi Transfer Mesh Short Sleeve Baselayer
$65.00
The perfect foundation to any high performance kit. This Men's Transfer Mesh Short Sleeve Baselayer is designed to regulate body temperature through moisture control to keep you riding in comfort across a broad temperature range. The airy, high-stretch PRO Transfer Mesh fabric is enhanced with In-R-Cool ® to improve thermoregulation and keep you cooler and dryer. GoFresh™â„¢ keeps the funk at bay and even allows this piece to be worn multiple times between washes, so you'll never have to ride without. Wear this baselayer on its own for the trainer, under a short sleeve jersey during the heat of summer, and then add it to your layering system in the spring or fall months for an additional layer of insulation.
Craft Active Intensity Crew
$64.99
Designed to perform during intense activities in mild to cold conditions. This crew neck base layer is constructed of bodymapped elastic fabric for ideal body temperature management. - Tight-fitting - Flatlock seams - Quick-drying
Craft Active Intensity Crew
$64.99
Designed to perform during intense activities in mild to cold conditions, this crew neck base layer is constructed of bodymapped elastic fabric for ideal body temperature management. - Tight-fitting - Flatlock seams - Quick-drying
Craft Greatness Bike Shorts
$64.99
- Slim, lightweight inner shorts with great fit, excellent moisture transport and C4 Pad - Material: 100% Polyester
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