Patagonia Wool base layer, blue, XL From the site- With its airy blend of merino and Capilene®, and an innovative, seamless 3D-knit structure, the women's Patagonia Capilene Air Crew base layer top offers amazing warmth and comfort range. BEST USE Multisport SHIRT TYPE T-shirt FABRIC 51% responsibly sourced merino wool/49% recycled polyester seamless zigzag knit comprised of 18.5-micron-gauge lotted wool SLEEVE LENGTH Long Sleeve Fine merino wool from New Zealand is blended with Capilene® recycled polyester for enhanced warmth balanced with improved wicking, durability and dry time 18.5-micron-gauge yarn; lotted-wool innovation Fabric is soft against the skin and stretches to move Seamless 3D construction eliminates chate points through the entire garment and has almost no wasted material Soft, stretchy elastic knit in the cuffs and hem for added recovery and comfort over extended use