Smartwool Men’S Active Fleece 1 2 Zip Cat Spring Summer Lenz knows how important proper AL216 40 IN Lenz knows how important proper fit is for comfort and performance so they have their designers create a different vest for each gender But it's more than just a one trick pony A four way stretch knit fabric for maximum mobility with soft brushed Merino next to your skin for long lasting comfort and breathability with a recycled synthetic material on the outside to protect you against the elements and add durability to the layer this looks sharp and keeps you comfortable during cool to cold weather runs layer for keeping comfortable while you're out in the cold