The Men's Classic All-Season Merino Base Layer Long Sleeve Topis made from a mixture of merino and nylon, which will help keep you warm and comfortable as you ski, run, hike and explore the great outdoors. Complete with offset shoulders and side seams to increase comfort and minimise chafing.Merino wool fabric made with an interlock knit - for enhanced comfort, breathability, thermoregulation, and odour resistanceSlim fit - follows contours of bodyMerino jersey fabric uses nylon core - to increase durability whilst still keeping 100% merino wool next to skinOffset shoulder and side seams - to increase comfort and minimise chafing Side seams wrap to front for body-enhancing fit Flatlock seam construction - designed to minimise chaffing Fit: SlimFabric: 87% Merino Wool / 13% Nylon