Fine merino wool from New Zealand blended with Capilene® recycled polyester for enhanced warmth balanced with improved wicking, durability and dry time 18.5-micron-gauge yarn; lofted-wool innovation Fabric is soft against skin and stretches to move Seamless 3-D construction eliminates chafe points through the entire garment and has almost no wasted material Elastic waistband is brushed for next-to-skin softness Patagonia Capilene Air Bottoms Womens