The Sierra’s superb Evolution traverse combines a chilled, pre-dawn start, high-altitude temperatures and sometimes-frigid shade with a non-stop, all-day pace. Designed to manage the extremes of high-output exertion, our Capilene® Midweight fabric hits the sweet spot of weight, breathability and wicking. Worn alone or under layers, it keeps you dry and comfortable during high-exertion activities in cool-to-cold weather. Constructed with 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. Solid-colored fabrics have 66% recycled-polyester content, heathers have 33% and both are treated with Polygiene® permanent odor control. Features include a brushed elastic waistband for next-to-skin softness, gusseted crotch for mobility and flatlock seams that minimize chafing.