A fine merino wool from New Zealand blended with Capilene® the Patagonia Cap Air Men's Crew is a slim fit baselayer with a seamless, 3-D knit structure. An airy blend of 51% merino and 49% recycled polyester the Cap Air Crew provides amazing warmth and a wide comfort range in a cozy textured knit. This wicks moisture, resists odor and dries in a flash thanks to an innovative Airblasting Technology which increases the loft of Capilene® while reducing weight and 18.5-micron-gauge yarn, blended they make this incredibly light while giving it terrific insulation. Buoyant, airy, light, with a fast dry time for core comfort this may be the greatest innovation in baselayers ever, the right combination of wool warmth and polyester quick dry durability.