FEATURES OF SMARTWOOL MEN'S MERINO SPORT 120 TANK This ultra-lightweight, super-soft, blended Merino and Tencel performance fabric is designed to help you stay cool and comfortable when you work up a sweat Odour-resistant Offset shoulder and side seams designed to increase comfort and minimize chafing Reflective elements for added visibility in low-light conditions Fabric Details 53% Merino Wool, 47% TENCEL Lyocell. Exclusive of Decoration. 53% Merino Wool, 47% TENCEL Lyocell. Exclusive of Decoration.