Smartwool's Intraknit Merino Tech 1/4 Zip. This mid layer features knit-in wind protection on the front panel and sleeves and a DWR finish for protection from the elements. But don't worry, we still incorporated targeted mesh venting to help keep things breathable while you're working up a sweat.

Men's Size Medium 68% Wool, 26% Polyester, 3% Elasthane, 3% Polyamide