The Berghaus Hyper 100 Jacket is an ultra-lightweight 3 layer jacket designed for fast and light days in the mountains when every gram counts fully waterproof but as light as a feather Designed by our MtnHaus research and development team this jacket features everything you need and nothing that you don t weighing in at just 97g this is the world s lightest 3 layer mountain jacket Hydroshell Elite Pro fabric is fully waterproof and highly breathable so that you ll remain comfortable and protected all day long