Patagonia's Long Sleeve Merino Daily V Neck T Shirt is made of Merino Daily, a regular fit, everyday Merino baselayer for all day comfort and easy care. Merino wool is naturally breathable, regulates body temperature and stretches. It's also wonderfully soft and naturally resists odor. Patagonia's merino wool is responsibly sourced from the grasslands of Patagonia. It is slow washed it for softness and shrink resistance, without the use of chlorine, then blend it with Capilene polyester for durability, quick dry times and moisture transfer superior to that of 100% merino. Features include a self fabric collar for chafe free comfort and full underarm gussets for unhindered shoulder mobility.