Arc'teryx Men's Nuclei Sl Jacket Synthetic insulation is warm and resilient DWR treated Arato 10 nylon ripstop shell is water repellant and light in weight No Slip Zip works like a series of speed bumps keeping the main zipper from self-opening Two insulated zippered hand pockets are placed out of the way of harnesses and backpacks Single hem cord adjustment tucks up inside the jackets to keep out of the way of gear loops