Recycled polyester double knit and plant-based HeiQ Mint odor control keep the Patagonia Capilene Lightweight Bottom fresh through days that don't have time for a wash. A gusseted crotch and form-fitting cut move through a full stride without binding at the hip. What Our Gearhead(R) Experts Are Saying:"I pulled these on before a long ridge traverse and forgot I had them on by the second mile. Sweat never had a chance to build up, even grinding out the exposed sections in full sun."