The Icebreaker Men's Helix LS Shirt is a reversible shirt that kinda looks like a jacket sometimes. One side gives you jacket-like style with its woven, 100% recycled polyester fabric while the other is all-shirt, with the 100% merino flannel. In between the two fabric options is 70g of MerinoLOFT(TM) Insulation to increase the warmth level on chilly days. Snap up the placket, go for a hike, jump in the car with your buds, get out and enjoy the day. Features of the Icebreaker Men's Helix Long Sleeve Shirt Reversible Center front snap placket Snap closure cuffs Snap close chest pocket Icebreaker pip label