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Trailkit Outdoor
A folded heather merino shirt on a flat rock in the right half, darker stone on the left

Base layers

Base layers

The shirt against your skin should move sweat. The puffy is for when you stop.

A base layer is not insulation you hike hard in. Synthetic shirts dry faster and smell stronger. Merino smells less and dries slower. A sun hoodie is often the better warm-weather shirt than a short-sleeve tee plus sunscreen on the arms.

Cotton next to skin is the layer to leave at home once you are away from the car. It stays wet and it stays cold. At a drive-up campground it is a preference, not a safety problem.

How to choose

  • Fit it close, not tight enough to bind under a pack belt.
  • Carry one dry shirt that never gets hiked in.
  • Sun hoodie first on exposed trail. Thermal layer first when you start cold and will not overheat.

Roundups

Two folded hiking base-layer tees on a granite slab next to a pack shoulder strapROUNDUP · BASE LAYERSR-01
Best hiking base layersFor hot miles, buy a synthetic shirt that dries quickly, such as Capilene Cool.

5 picks · updated OCT 2026 · start here Patagonia Capilene Cool Daily

Gear in this category

A lightweight synthetic hiking tee folded on a granite slab
Base layersPatagonia Capilene Cool DailyHot-weather hiking shirtsSynthetic · About 5 oz · Mid
A merino base-layer tee folded on a granite slab
Base layersIcebreaker 175 OasisMulti-day wear when odor mattersMerino · About 6 oz · Upper mid
A merino base-layer crew folded on a granite slab
Base layersREI Co-op Merino 185A first merino layer without a designer priceMerino · About 7 oz · Mid
A thin sun hoodie folded on a granite slab
Base layersOutdoor Research Echo HoodySun and bugs on exposed trailSun · About 6 oz · Mid
A grid-fleece winter base layer folded on a granite slab
Base layersPatagonia Capilene Thermal WeightCold mornings and camp under a puffySynthetic · About 8 oz · Mid

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