Product Description New for 2022 - Long sleeve base layer shirt made from naturally odor resistant Merino wool. 1/4 length zipper for added ventilation. Hood is designed to add warmth on the coldest days. 100% Merino wool main body fabric 190 gram weight 9.5 micron thread Elastic bound hood 1/4 zip front zipper Flat lock stitching throughout reduces chafing Integrated panel thumb holes