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Men's Base Layer Tops

Icebreaker Men's Merino 200 Oasis Long-Sleeve Crewe Thermal Top

$105.00

REI Co-op Men's Lightweight Base Layer Half-Zip Top

$44.95

Patagonia Men's Capilene Midweight Zip-Neck Base Layer Top

$89.00

Icebreaker Men's 200 Oasis Crewe Base Layer Top

$95.00

Helly Hansen Men's HH Lifa Active 1/2-Zip Base Layer Top

$52.73 $70.00

REI Co-op Men's Merino 185 Long-Sleeve Half-Zip Base Layer Top Tall Sizes

$89.95

Arc'teryx Men's Rho LT Base Layer Hoodie

$89.83 $130.00

Burton Men's Midweight X Base Layer Long-Neck Hoodie

$44.83 $89.95

Artilect Men's Boulder 125 Crew Base Layer Top

$120.00

Ortovox Men's 185 Merino Rock'n'wool Long-Sleeve Base Layer Top

$110.00

REI Co-op Men's Midweight Long-Sleeve Base Layer Top

$54.95

Ortovox Men's 230 Competition Long-Sleeve Base Layer Top

$110.00

Icebreaker Men's 125 ZoneKnit Long-Sleeve Crewe Base Layer Top

$125.00

Seirus Men's Heatwave Reversible Long-Sleeve Crew Base Layer Top

$99.95

The North Face Men's FD Pro 160 Base Layer Crew Top

$70.00

Icebreaker Men's Merino 200 Oasis Long-Sleeve Crewe Thermal Top

$73.73 $105.00

Arms of Andes Men's 300 Alpaca Wool Long-Sleeve Crew Base Layer Top

$130.00

Free Country Men's Force Grid Fleece Crew Base Layer Top

$31.73 $45.00

Icebreaker Men's Shifter Long-Sleeve Sweatshirt

$145.73 $195.00

Icebreaker Men's Merino 175 Everyday Long-Sleeve Half-Zip Base Layer Top

$70.73 $95.00

Icebreaker Men's Merino 200 Oasis Long-Sleeve Crewe Remarkables Base Layer Top

$85.73 $115.00

Icebreaker Men's Merino 260 Vertex Long-Sleeve Crewe Natural Shades Base Layer Top

$104.73 $140.00

Helly Hansen Men's LIFA Merino Midweight 2-In-1 Base Layer Hoodie

$89.73 $120.00

Icebreaker Men's 260 ZoneKnit Merino Long-Sleeve Half-Zip Thermal Base Layer Top

$119.73 $175.00

Icebreaker Men's 200 Oasis Half-Zip Base Layer Top

$85.93 $115.00

REI Co-op Men's Lightweight Base Layer Long-Sleeve Zip-Neck Top Tall Sizes

$44.95

Smartwool Men's Intraknit Thermal Merino Crew Base Layer Top

$130.00

tasc Performance Men's Elevation Merino T-Shirt

$49.73 $79.00

Helly Hansen Men's Lifa Merino Midweight Crew Base Layer Top

$100.00

REI Co-op Men's Merino 185 Long-Sleeve Base Layer Top

$55.93 $79.95

Arc'teryx Men's Rho LT Zip-Neck Base Layer Top

$130.00

Smartwool Men's Classic Thermal Merino Base Layer Hoodie

$104.73 $145.00

Artilect Men's Flatiron 185 Quarter-Zip Base Layer Top

$160.00

Ortovox Men's 120 Cool Tec Clean Base Layer T-Shirt

$90.00

Arc'teryx Men's Rho Heavyweight Zip-Neck Base Layer Top

$150.00

Ortovox Men's 230 Competition Zip-Neck Base Layer Top

$120.00

Smartwool Men's Classic All-Season Merino Long-Sleeve Base Layer Top

$90.00

Smartwool Men's Classic Thermal Merino Quarter-Zip Base Layer Top

$83.73 $120.00

Icebreaker Men's 200 ZoneKnit Crewe Base Layer Top

$74.83 $150.00

Seirus Men's Heatwave Body Mapped Long-Sleeve Base Layer Crew Top

$129.95

Helly Hansen Men's H1 Pro Lifa Seamless Half-Zip Base Layer Top

$112.73 $150.00

Free Country Men's Microtech Heat Base Layer Top

$28.73 $45.00

Ortovox Men's 185 Rock'n'wool Long-Sleeve Base Layer Top

$76.73 $110.00

Icebreaker Men's 200 Oasis Long-Sleeve Crewe Last Run Base Layer Top

$85.73 $115.00

Icebreaker Men's Merino 200 Sonebula Long-Sleeve High-Neck Base Layer Top

$93.73 $125.00

Helly Hansen Men's LIFA Active Stripe Crew Base Layer Top

$44.73 $60.00

Icebreaker Men's Merino 200 Oasis Long-Sleeve Half-Zip Thermal Base Layer Top

$79.73 $115.00

Patagonia Men's Capilene Thermal Weight Long Underwear Crew Top

$99.00

REI Co-op Men's Lightweight Base Layer Long-Sleeve Crew Top

$39.95

REI Co-op Men's Lightweight Base Layer Crew Top

$29.95

Icebreaker Men's Merino 260 Tech Long-Sleeve Crewe Thermal Top

$125.00

Smartwool Men's Classic Thermal Merino Crew Base Layer Top

$115.00

Smartwool Men's Intraknit Thermal Max Merino Quarter-Zip Base Layer Top

$115.73 $155.00

REI Co-op Men's Merino 185 Long-Sleeve Base Layer Top Tall Sizes

$79.95

Picture Organic Clothing Men's Nangha Base Layer Top

$44.83 $90.00

Icebreaker Men's Merino 175 Everyday Long-Sleeve Crewe Thermal Top

$63.73 $85.00

Artilect Men's Flatiron 185 Base Layer Crew Top

$140.00

Ortovox Men's 185 Merino Rock'n'wool Base Layer Top

$100.00

Craft Men's Active Intensity Zip Base Layer Top

$39.73 $74.95

The North Face Men's Summit Pro 120 Crew Base Layer Top

$100.00

Smartwool Men's Intraknit Active Base Layer Top

$110.00

Arms of Andes Men's 160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt

$85.00

Arc'teryx Men's Rho Hybrid Half-Zip Base Layer Top

$130.00

Seirus Men's Heatwave Quick Body Mapped Long-Sleeve Base Layer Hoodie

$134.95

Arc'teryx Men's Ionia Merino Wool Base Layer Hoodie

$140.00

Arms of Andes Men's 160 Ultralight Alpaca Wool Crewneck Base Layer T-Shirt

$75.00

Terramar Men's 3.0 Thermawool Heavyweight Thermal Crew Shirt

$49.73 $70.00

Icebreaker Men's Merino 200 Oasis Long-Sleeve Crewe First Snow Base Layer Top

$89.73 $120.00

Icebreaker Men's Merino 200 Sonebula Long-Sleeve Crewe Base Layer Top

$89.73 $120.00

Helly Hansen Men's LIFA Merino Midweight Half-Zip Base Layer Top

$79.73 $110.00

Icebreaker Men's Merino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top

$97.73 $135.00

Patagonia Men's Capilene Thermal Weight Zip-Neck Top

$109.00

REI Co-op Men's Lightweight Base Layer Long-Sleeve Crew Top Tall Sizes

$39.95

Patagonia Men's Capilene Midweight Crew Base Layer Top

$79.00

Icebreaker Men's Merino 260 Tech Long-Sleeve Half-Zip Thermal Top

$66.83 $135.00

Helly Hansen Men's HH Lifa Active Crew Base Layer Top

$44.73 $60.00

REI Co-op Men's Merino 185 Long-Sleeve Half-Zip Base Layer Top

$62.93 $89.95

REI Co-op Men's Merino 185 Base Layer Top

$48.93 $69.95

Burton Men's Midweight Base Layer Crew Top

$31.83 $64.95

Artilect Men's Boulder 125 Quarter-Zip Base Layer Top

$130.00

Ortovox Men's 120 Comp Light Long-Sleeve Base Layer Top

$100.00

REI Co-op Men's Midweight Base Layer Half-Zip Top

$59.95

Ortovox Men's 120 Comp Light Base Layer Hoodie

$120.00

Icebreaker Men's 200 Oasis Long-Sleeve Crewe Move to Natural Base Layer Top

$78.73 $105.00

Seirus Men's Heatwave Lite Reversible Long-Sleeve Base Layer Top

$74.95

Arms of Andes Men's 300 Lightweight Alpaca Wool Half-Zip Base Layer Top

$135.00

Arc'teryx Men's Rho LT Crew Neck Base Layer Top

$100.00

Craft Men's CORE Dry Active Comfort Base Layer Top

$39.73 $64.95

Arc'teryx Men's Ionia Merino Wool Base Layer Top

$90.00

Icebreaker Men's 125 ZoneKnit Merino Long-Sleeve Crewe Thermal Top

$93.73 $125.00

Terramar Men's 4.0 Beast Half-Zip Base Layer Top

$49.73 $70.00

Icebreaker Men's Merino 200 Oasis Long-Sleeve Half-Zip First Snow Thermal Base Layer Top

$93.73 $125.00

Icebreaker Men's Merino 200 Sonebula Long-Sleeve Half-Zip Hood Base Layer Top

$111.73 $150.00

Helly Hansen Men's LIFA Merino Midweight Crew Base Layer Top

$74.73 $100.00

Icebreaker Men's 200 ZoneKnit Merino Long-Sleeve Half-Zip Thermal Base Layer Top

$109.73 $160.00