This Smartwool Intraknit Thermal Merino Base Layer Colorblock 1/4 Zip is designed to boost performance and help you move with ease. It combines a Merino wool Intraknit™ construction to keep you dry, regulate temperature, and resist odors. Strategic mesh panels add breathability in key places, and the striking colorblock patterns will turn heads. Enjoy superior comfort and performance with this top-of-the-line base layer.