Layer up for sledding, skating or shredding in the men's Helly Hansen Lifa Merino Midweight Crew base layer top. Its 2-layer construction combines cozy merino wool with durable technical fabric.

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Whether you're laying out at the beach or poolside or adventuring through the mountains, the Hemlock Hat Co. Lifeguard hat has you covered with its broad brim that shades you from sun.

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Get warmth without bulk—the women's Outdoor Research Liftie VX beanie pairs VerticalX™ Air insulation with a fuzzy lining and cute pom to make this the perfect beanie for all-day wear in the cold.

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Reach for this highly breathable Patagonia Lightweight A/C women's button-down shirt in sultry climates. It's made from a soft crepe blend of organically grown cotton and hemp to keep you cool.

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The airy Patagonia Lightweight A/C shirt for women creates a breeze when there isn't one. Its organically grown cotton crepe-woven fabric with a touch of hemp is perfect for hot and humid conditions.

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For humid days on the coast, these Patagonia Lightweight All-Wear Hemp shorts keep you airy, cool and comfortable. Flat-front chino styling gives them a classic look.

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For humid days on the coast, these Patagonia Lightweight All-Wear Hemp shorts in an 8 in. inseam keep you airy, cool and comfortable. Flat-front chino styling gives them a classic look.

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From morning's first frosty steps to midday sweat and exhilaration, the men's REI Co-op lightweight base layer bottoms wick and breathe to keep you comfortable all the way.

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These REI lightweight base layer bottoms are designed to keep you warm and wick away moisture during high-performance outdoor activities when the temperature starts to drop.

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The men's REI Co-op lightweight base layer bottoms wick and breathe to keep you comfortable from the first cold steps of morning to sweaty exhilaration on the trail hours later.

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Heading out to play hard? The REI Co-op lightweight base layer crew top keeps you warm until you warm up, then wicks sweat to maintain your cool when you're charging.

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Comfy as you warm up, comfy as you cool down, comfy when you break a sweat. The women's REI Co-op lightweight base layer top is ideal for hiking, cycling and even sleeping—especially in the summer.

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Comfy as you warm up, as you cool down and when you break a sweat. The women's REI Co-op lightweight base layer top is ideal for hiking, cycling and even sleeping—especially in the summer.

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First half-mile cold; next 3 miles sweaty; lunch break cold. Don't stress—the REI Co-op lightweight half-zip long-sleeve base layer wicks and breathes to keep you comfortable all day.

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