Features of Smartwool Women's Merino Sport 150 Tee Fabric combines the moisture management, temperature regulation, and odour resistance of Merino with the durability and quick dry time of recycled polyester UPF 20+ Fabric Details 56% Merino Wool, 44% Polyester. Exclusive Of Decoration. 56% Merino Wool, 44% Polyester. Exclusive Of Decoration.