Features of Smartwool Women's Merino Sport 120 High Neck 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 Fabric Details 53% Merino Wool, 47% Lyocell. Exclusive Of Decoration. 53% Merino Wool, 47% Lyocell. Exclusive Of Decoration.