Men's Clothing - Underwear - Lightweight Long Underwear - Tops

686 Direct Layer Long Underwear Top - Men's $36 Pull on the 686 Direct Top Layer as your defense against clammy, cold skin while you ride.

Arc'teryx Rho SL Crew - Men's $64.95 Arc'Teryx made the Rho SL Long-Sleeve Crewneck Shirt to be a versatile and lightweight shirt that works by itself in warm weather or as a baselayer in colder conditions.

Burton Lightweight Crew - Men's $39.95 Layer the Burton Mens Lightweight Crew under your puffy, shell, hoody, or fleece before you head out to charge the steeps this winter. DryRide Ultrawick fabric pulls moisture away from your skin.

Cloudveil Run Don't Walk Light Top - Men's $84.95 For deep-winter layering or powering through a fall trail run, nothing beats the lightweight moisture management of the Cloudveil Mens Run Dont Walk Light Top.

Helly Hansen Crew Top - Men's $39.95 Wear the Helly Hansen Men's Crew Long-Sleeve T-Shirt as a base layer when you skin up a ridge for turns or alone for a trail run in cold weather.

I/O Biocompatibles Contact Crew Shirt - Long-Sleeve - Men's $64.95 I/O Biocompatibles Contact Crew Shirt - Long-Sleeve - Men's

Ibex Woolies Crew - Long-Sleeve - Men's $68.95 Layer the Ibex Men Woolies Crew Long Sleeve Shirt under other layers in the winter, or wear it by itselfeither way, this form fitting shirt regulates your temperature, wicks moisture, and fights funk.

Ibex Woolies Zip T-Neck Shirt - Long-Sleeve - Men's $71.95 Zip up the Ibex Men's Woolies Zip T-Neck Top to tackle the steep and deep and then keep it on for that aprs ski party with friends.

Icebreaker BodyFit 150 Atlas Top - Long-Sleeve - Men's $44.96 Wear the Icebreaker Men's BodyFit150 Atlas T-Shirt for traveling the globe, going for a hike, or hitting up the local climbing gym for a quick bouldering session. This slim-fit, merino wool tee regulates your temperature and wicks sweat.

Icebreaker BodyFit200 Mondo 1/4-Zip Top - Long-Sleeve - Men's $74.95 The Icebreaker Men's BodyFit Mondo Zip Topnot to be confused with a turtle neck.

Icebreaker BodyFit200 Oasis Crew - Men's $45.47 The Icebreakers Men's BodyFit200 Oasis Crew is a great all-around lightweight base layer made from the ultimate breathable insulationMerino wool.

Icebreaker BodyFit200 Oasis Printed Crewe - Long-Sleeve - Men's $99.95 Icebreaker BodyFit200 Oasis Printed Crewe - Long-Sleeve - Men's

Marmot Lightweight Crew - Long-Sleeve - Men's $41.95 Whether used as a layering piece or worn alone, the anti-microbial Marmot Men's Lightweight Long-Sleeve Crew wicks moisture away from your skin when you work up a sweat.

Marmot Lightweight Crew - Short-Sleeve - Men's $39.95 Harness the power of the coconut when you pull on the Marmot Mens Lightweight Crew.

Marmot Lightweight Zip-Neck Shirt - Long-Sleeve - Men's $47.95 Layer with the moisture-wicking Marmot Men's Lightweight Long-Sleeve Zip Neck shirt on chilly days and bust open the neck zipper when you need to dump some serious heat.

Mountain Hardwear Advance Lightweight Crew - Long-Sleeve-Men's $39.95 The Mountain Hardwear Men's Advance Lightweight Long-Sleeve Crew offers dry, light warmth when worn alone, or you can layer it under a vest or jacket for moisture management in colder weather.

Mountain Hardwear Advance Lightweight Crew - Men's $34.95 Make the Mountain Hardwear Mens Advance Lightweight Short-Sleeve Crew Shirt the first thing you put on for everything from a fall trail run to a day pillaging backcountry powder stashes.

Mountain Hardwear Advance Lightweight Zip T - Men's $44.95 Wear the Mountain Hardwear Men's Advance Lightweight Zip T for some serious wicking, quick-drying action. Treated with a natural substance called Chitosan, the Advance Zip T resists odors, fungus, and bacteria as well.

Mountain Hardwear Continuum Lightweight Crew - Long-Sleeve - Men's $54.95 Think of the Mountain Hardwear Mens Continuum Lightweight Crew as your partner in crime for your many interests. This compatible base layer keeps you dry and comfortable whether youre rock climbing in the summer or skiing in the winter.

Mountain Hardwear Lightweight Power Stretch Crew - Long-Sleeve - Men's $59.95 Pull on the Mountain Hardwear Mens Lightweight Power Stretch Crew under your shell when you take off for the mountains. Mountain Hardwear used a lightweight Polartech Power Stretch fabric that wicks moisture and dries quickly.

Mountain Hardwear Lightweight Power Stretch Zip T - Men's $69.95 The Mountain Hardwear Lightweight Power Stretch Zip T sports lightweight, moisture wicking Polartech Power Stretch fabric to give you a snug fit under your shell and keep you comfortable and dry when you sweat.

Patagonia Capilene 1 Crew - Long-Sleeve - Men's $40 The Patagonia Men's Capilene 1 Long-Sleeve Crew is an ultralight, fast-wicking top for warm-weather trail runs or hikes.

Patagonia Capilene 1 Graphic Crew T-Shirt - Long-Sleeve - Men's $40 The Patagonia Men's Capilene 1 Band Brand Graphic Long-Sleeve T-Shirt combines casual looks with the technical abilities to go into the mountains.

Patagonia Merino 1 Crew - Long-Sleeve - Men's $90 Whether its worn alone in warm climates or under three layers in plunging winter temps, the Patagonia Mens Merino 1 Crew gives you the same moisture-wicking, quick-drying, odor-fighting powers.

Patagonia Merino 1 T-Shirt - Short-Sleeve - Men's $80 Hot, sweaty trail runs and summertime hikes just got more comfortable thanks to the Patagonia Mens Merino 1 T-Shirt.

Patagonia Merino 2 Zip-Neck Top - Men's $80 Fall sending temps have arrived, which means its time to pull on the Patagonia Mens Merino 2 Zip-Neck Top and get after that multi-pitch project that you and you buddy have been eyeing all summer.

SmartWool Lightweight 1/4-Zip Top - Long-Sleeve - Men's $79.95 The Smartwool Mens Lightweight -Zip Top is like the caped crusader of the baselayer worldat any time its ready to wick moisture, dry in a flash, and naturally fight odors thanks to its soft, stretchy merino wool construction.

SmartWool Lightweight Crew Top - Long-Sleeve - Men's $69.95 SmartWool Lightweight Crew Top - Long-Sleeve - Men's

SmartWool Microweight 1/4-Zip Top - Long-Sleeve - Men's $74.95 SmartWool Microweight 1/4-Zip Top - Long-Sleeve - Men's

SmartWool Microweight Crew Shirt - Long-Sleeve - Men's $47.96 Wear the SmartWool Men's Microweight Long-Sleeve Crew Shirt for cool- or warm-weather aerobic activities or as a next-to-skin base layer.

SmartWool Microweight Crew Shirt - Long-Sleeve - Men's $64.95 SmartWool Microweight Crew Shirt - Long-Sleeve - Men's

SmartWool Microweight Zip T-Shirt - Long-Sleeve - Men's $55.96 Wear the SmartWool Men's Microweight Zip-T for stop-and-go aerobic activities or as a warm base layer.

The North Face XTC Lightweight 1/4 Zip Shirt - Long-Sleeve - Men's $41.95 The North Face Mens XTC Lightweight -Zip Long-Sleeve Shirt combines bamboo-infused polyester, flatlocked seams, and underarm gussets, to give you a highly breathable, and protective layer for cool-weather activity.

The North Face XTC Lightweight 1/4 Zip Shirt - Men's $29.37 The North Face Mens XTC Lightweight -Zip Long-Sleeve Shirt combines bamboo-infused polyester, flatlocked seams, and underarm gussets, to give you a highly breathable, and protective layer for cool-weather activity.

The North Face XTC Lightweight Crew - Men's $26.57 Tired of your base layers restricting your movement? The North Face Men's XTC Lightweight Crew has underarm gussets for a full range of motion. This long-sleeve shirt dries quickly and resists odor.

The North Face XTC Lightweight Crew Top - Long-Sleeve - Men's $37.95 Thanks to a polyester knit infused with bamboo carbon, The North Face Mens XTC Lightweight Crew Top wicks moisture like crazy and resists funky odors during multi-day use.

Under Armour Base 1.0 Crew Top - Long-Sleeve - Men's $39.95 Pull on the Under Armour Men's fitted Base 1.0 Crew Long Underwear Top for early spring runs.

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