Hot Chillys Women's Wool Stretch Crewneck Top 84% Polyester/11% Merino Wool/5% Spandex Imported Hot Chillys Merino wool blend is soft and non itchy, making it incredibly comfortable to wear under all your other layers Mtf (moisture transfer fiber) wicks energy-sapping perspiration Hot Chillys wool base layers are created from a blend of Merino wool and our own mtf Fibers