evo.com | Smartwool Long Underwear Tops > A base layer that earns its keep on ski days, trail days, and everything in between. The Smartwool Classic Merino Blend Base Layer Crew Top combines 50% Merino wool with 50% COOLMAX recycled polyester, a naturally temperature regulating blend that wicks moisture for maximum next-to-skin comfort. Flatlock Seam Construction Designed to Eliminate Chafing 50% Merino Wool / 50% COOLMAX(R) ECOMADE Recycled Polyester Slim Fit Intended to follow the contours of the body. | Kid's Smartwool Classic Blend Base Layer Crew Top 2027 - X-Large Gray | Wool/Polyester