The popular Merino 150 Base layer with an added 1/4 zip,, making it the perfect base layer for warm or cold weather.Merino 150This breathable, soft, lightweight fabric offers next-to-skin comfort, moves sweat away from the body, and acts as a versatile performance layer for warmer conditions.Core SpunMerino fibres wrapped around a nylon core for added durability while still keeping the comfort of Merino next to skin Slim Fit Raglan sleeve design removes shoulder seams 8" (20 cm) center front zipper with semi-locking logo slider Flatlock seam construction designed to minimize chafing Knit in Vietnam: 87% Merino Wool, 13% Nylon Garment Weight: 193 g = 6.8 oz