Serious hiking is all about layers. You need to be prepared for changing climates, wind chills, and low body temps. Like a sturdy house or a really good bean dip, the foundational first layer is always the most important. ThermalClime is a lightweight performance piece designed to be your adventure outfit's base layer. The knit construction pulls moisture away from your skin and pushes it up to the surface, providing breathability and comfort. And the flat-locked seams and stretchy polyester make it easier for you to move quickly when you need to.