An all-purpose (AR = All Round) fleece that crushes as a mid-layer or only-layer, the Arc'teryx Kyanite AR Half Zip Jacket is a new take on the full-zippered Kyanite that's impressed us for years. Built of Polartec® Power Stretch® Pro to let you get the most out of your active life, the Kyanite AR Half Zip is an essential that you'll fall back on year after year.