It might be summer everywhere else, but on Mount Hunter's Kennedy-Lowe Route, it always feels like the middle of winter. Designed to manage the extremes of high-output exertion, Patagonia's Capilene Midweight fabric hits the sweet spot of weight, breathability and wicking that, worn alone or with additional layers, is the essence of versatility. It keeps you dry and comfortable when worn during high-exertion activities in cool-to-moderate temperatures and insulates beneath a shell in cold weather. Constructed with a Polartec Power Grid fabric, it has a smooth face for easy layering and a brushed-back grid that aids in wicking as well as warmth. The fabric is bluesign approved, has 66% recycled-polyester 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.