Description : Now in long sleeve! The UnDWool is the warmest base layer in the UnDSystem. DeFeet knits the highest grade wools on the planet into a special fabric that is thin, elastic, soft yet durable. Adorning the front of the collar is a small, woven D logo label. We were so thrilled with the UnD Wool we couldn't resist adding this signature of class, like the bolting on of a head tube badge to finish a fine custom frame. Crae: Care Instructions : Turn inside out, machine wash gentle or hand wash, dry flat, do not bleach.