The Capilene 4 Expedition Weight Bottom from Patagonia is made from Polartec Power Dry High Efficiency fabric for excellent warmth retention and breathability. In fact, the Cap 4 Expedition Weight Bottom is the warmest and most breathable baselayer in the Capilene family, so you're guaranteed to stay warm and dry no matter where you set up base camp.
Polartec® Power Dry® High Efficiency™ fabric has a smooth jersey face for easy layering
Open grid next to skin provides superior warmth, breathability and moisture-wicking performance
Spandex adds stretch and ease of movement
Elastic waistband is brushed for next-to-skin softness
Gusseted crotch for unimpeded mobility
Machine wash cold, tumble dry at low temperature
3.8-oz (129-g) Polartec® Power Dry® High Efficiency™ fabric (solids: 92% all-recycled polyester/8% spandex; heathers: 91% polyester (30% recycled)/9% spandex), with Polygiene® permanent odor control