Unable to accept returns on base layers. The perfect base layer for every adventure regardless of season, Merino Wool works to regulate your body temperature, wicks sweat away as a vapor, and cancels out odors. We use 190gsm merino wool for our lightweight base layers We also use fine fibers measuring 19.5 microns, which is the secret to making a wool garment that does NOT itch. This top features a half zip for ventilation, a hood for additional warmth or sun protection and a convenient vertical chest pocket. Also features thumb holes in cuffs for helping keep hands warm and/or holding sleeves in place when adding an additional layer. Materials 190gsm merino wool Features Half zip for ventilation Hood for additional warmth or sun protection Vertical chest pocket Thumb hole cuffs