The men's Tech Top Long Sleeve Half Zip is a winter sports MVP. Built from Icebreaker highly insulating 260gm merino fabric, it keeps your body warm but remains breathable and amazingly soft when worn as a baselayer, or alone on long hikes in the high mountains. With set in sleeves, forward side seams and offset shoulder seams, it won't chaffe when you work out or under a pack, and the drop tail hem provides a little extra coverage against chilly air. If you really start to heat up, the half zip provides instant cooling. And merino's natural odor resistance makes it the perfect jersey for multi day adventures.