In the Alaska Range, the calendar says May, but the weather says full on cold. Equally at home during high exertion alpine routes or freezing nights in a sleeping bag, the micro grid fleece interior of our Capilene Thermal Weight provides the greatest warmth combined with the greatest breathability of any baselayer in our lineup. Soft, stretchy and compressible, the Polartec Power Grid fabric has a smooth face that glides beneath layers and a brushed fleece interior to warm your core, wick moisture and feel smooth against your skin. Capilene Thermal Weight is bluesign approved, has 30 92% recycled content and is treated with Polygiene permanent odor control. Features include a brushed elastic waistband for next to skin softness, a gusseted crotch for mobility, a functional fly, and flatlock seams to minimize chafing.