With its innovative, seamless, 3-D knit structure, the Patagonia Men's Capilene® Air Crew offers amazing warmth and comfort range. An airy blend of 51% merino wool and 49% recycled polyester wicks moisture, resists odor and dries in a flash. Capilene® Air is the most advanced baselayer Patagonia have ever made. It has the greatest range of warmth and comfort of any of their baselayers, insulates even when wet, dries quickly, and resists odors for day after day use. Made from an airy blend of 51% merino wool from New Zealand 49% Capilene® recycled polyester, Capilene® Air feels light and soft on the skin and stretches naturally to move with the body in motion. Patagonia created the soft 18.5-micron-guage-yarns used in Capilene® Air with an innovative airblasting technology that dramatically increases the yarn’s loft while reducing weight compared to traditional wool yarn. Seamless 3-D construction eliminates chafe points throughout the entire garment and nearly eliminates wasted material. Soft, stretchy elastic knit in the cuffs and hem keep the garment positioned where you want it and add skin-pampering comfort for extended use. With a gender-specific box-stitch texture to trap warmth and allow airflow. Features and Specifications 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 with the body Seamless 3-D construction eliminates chafe points through the entire garment and has almost no wasted material Soft, stretchy elastic knit in cuffs and hem for added recovery and comfort over extended use 184 g (6.5 oz) Materials: 5.6-oz (190-g) 51% merino wool/49% recycled polyester seamless box-stitch knit comprised of 18.5-micron-gauge lofted wool Patagonia Men's Capilene Air Crew Thermal Top - Merino Blend Thermal Underwear