Features of Smartwool Women's Merino 150 Lace Baselayer LS Top Lightweight lace fabric combines the moisture management, temperature regulation, and odour resistance of Merino with the durability of nylon Back body seam wraps to front for body-enhancing Fit Merrow seam construction designed to minimize chafing Fabric Details 77% Merino Wool, 23% Nylon. Exclusive Of Decoration. 77% Merino Wool, 23% Nylon. Exclusive Of Decoration.