The Patagonia Men's Capilene Thermal Weight Bottoms are Patagonia's warmest, most breathable polyester baselayer with minimal bulk and Polygiene® permanent odor control 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 Patagonia's Capilene® Thermal Weight provides the greatest warmth combined with the greatest breathability of any baselayer in their 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 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. Features and Specifications Polartec® Power Grid™ fabric has a smooth face for easy layering Fabric’s open-grid pattern next to skin provides superior warmth, breathability and moisture-wicking performance with Polygiene® permanent odor control Spandex for stretch and ease of movement Elastic waistband is brushed for next-to-skin softness Gusseted crotch for comfort and unimpeded mobility Functional fly Flatlock seams to minimize chafing 3.8-oz (129-g) Polartec® Power Grid™ fabric. Solids: 92% recycled polyester/8% spandex; heathers: 92% polyester (30% recycled)/8% spandex; both with Polygiene® permanent odor control. Fabric is bluesign® approved 133 g (4.7 oz) Made in El Salvador. Patagonia Men's Capilene Thermal Weight Bottoms Thermal Underwear