Castelli believes so much in the power of the fabric it uses to craft the Core Mesh 3 Sleeveless Baselayer that it deviated from its usual performance-related fabric monikers and named it Magic Mesh.&nbsp;

Castelli Core Mesh 3 Sleeveless Baselayer - Men's

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Curating gear for diverse people of all walks of life pushing boundaries through the exploration of the outdoors.

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It&rsquo;s hard to beat THE ORIGINAL. This is the one-piece hooded base layer that started it all, developed to virtual perfection over the course of nearly 20 years of testing and abuse by our Ninja Ambassadors and Professional Team. If you need base layer, this is simply the best. Experience all of the action and fringe benefits of being a Ninja, while enjoying the undeniable function (and fashion) of the original Ninja Suit.

Airblaster Men's Classic Ninja Suit - 2025 model

Get the comfort and warmth of our heaviest weight base layer in a pullover with our new Men's Merino 250 Base Layer Hoodie. Featuring a mountain-inspired pattern and a higher neck on the hood for more coverage when worn down, this 100% Merino wool hoodie makes it easy to get inspired and feel prepared to brave the cold weather for your next adventure.

Smartwool Classic Thermal Merino Base Layer Bottom

A classic, all-around polyester baselayer made with 100% recycled content. The smooth, soft face makes for easy layering. Hollow-core yarns and a diamond-grid back trap warm air, wick moisture and dry fast. HeiQ Fresh durable odor control keeps things fresh. Fair Trade Certified sewn.

Patagonia Capilene Midweight Bottom

Boxer briefs so nice you'll want to display them on your balcony.

Stance Regulation Boxer Brief

Saxx Kinetic Hd Long Leg Underwear

UA Base 3.0 is built for very cold weather and moderate activity. It uses a unique pattern that's designed to trap heat without adding bulk. Think long underwear, revamped for today's top athletes.

Under Armour Coldgear Base 3.0 Crew Shirt

Smartwool Classic Thermal Colorblock Crew Baselayer

Whether we are headed to work or getting dressed at a campsite, we trust the Ortovox 185 Rock'N'Wool Boxer to keep us comfortable. These boxer briefs use a merino wool construction to pull moisture off of our skin, dry quickly, prevent overheating, and even fight odors.

Ortovox 185 Rock'N'Wool Boxer

Ready for whatever our day has in store, the ExOfficio Give-N-Go Sport 2.0 3in Boxer Brief keeps us feeling fresh. The boxer brief cut offers a familiar fit and feel, while the nylon and elastane blend allows us to move freely while it wicks moisture to keep us fresh.

ExOfficio Give-N-Go Sport 2.0 3in Boxer Brief

Designed as a base or mid-layer for chilly winter rides or as a stand-alone layer on cool-weather rides, the Pro Alpha Layer is a staple in our fall-to-winter cycling apparel selection.

PEARL iZUMi Pro Alpha Layer - Men's

Active Extreme X Wind SS is a highly functional baselayer tee with wind protection at front designed for racing and high-intensity workouts in cold and windy conditions.

Craft Active Extreme X Wind Short-Sleeve Baselayer

A solid base layer is key to staying comfortable in the saddle, and the Base Layer 1 Sleeveless from Q36.5 is a lightweight essential for warm-weather rides. Designed with a seamless construction, it moves with us effortlessly, feeling like a second skin while keeping chafing at bay.

Hit the office, the trail, or a long-distance flight in comfort with the Everyday Merino Boxer Briefs. These everyday boxers combine the thermoregulating and odour-resistant properties of merino wool with the soft and cooling of TENCEL Lyocell.

Smartwool Everyday Merino Boxer Brief Boxed - Men's

Underwear so comfortable, you won't want to take it off. Luxuriously soft Tencel Modal feels fantastic next to skin, and a hint of spandex lets them move with you. Using MyPakage technology, the 3-D pouch cradles you from every angle, and a pucker panel eliminates seams in sensitive areas to prevent chafing or discomfort.

No one wants Sweaty Saxx. With highly breathable fabric and quick-dry technology, the Hot Shot boxers beat the heat where it matters. An articulated front pouch stabilizes the boys while preventing unwanted friction.

Whether we're setting out on the skin track or simply enjoying a hike in the freezing temps, we reach for the 185 Rock'N'Wool Long Pant as our trusty first layer. Unlike old-fashioned wool products, Ortovox's Tasmanian merino is ultra-soft and itch-free while maintaining wool's natural ability to manage odors and moisture. Its lightweight threads and next-to-skin fit are built to layer up, so we're cozy as can be with a shell and more keeping us safe from the cold.

Castelli Core Mesh 3 Sleeveless Baselayer - Men's

Baselayers & Undies - Men

Airblaster Men's Classic Ninja Suit - 2025 model

Smartwool Classic Thermal Merino Base Layer Bottom

Patagonia Capilene Midweight Bottom

Stance Regulation Boxer Brief

Saxx Kinetic Hd Long Leg Underwear

Under Armour Coldgear Base 3.0 Crew Shirt

Smartwool Classic Thermal Colorblock Crew Baselayer

Ortovox 185 Rock'N'Wool Boxer

ExOfficio Give-N-Go Sport 2.0 3in Boxer Brief

PEARL iZUMi Pro Alpha Layer - Men's

Craft Active Extreme X Wind Short-Sleeve Baselayer

Q36.5 Base Layer 1 Sleeveless

Castelli Core Mesh 3 Sleeveless Baselayer - Men's

Smartwool Everyday Merino Boxer Brief Boxed - Men's

BN3TH Classic Trunks Solid (2 Pack) - Men's

Saxx DropTemp Cooling Mesh Boxer Briefs - Men's

185 Rock'N'Wool Long Pant - Men's