The Stretch Ozonic jacket is an interesting addition to Mountain Hardwears' range of popular rain jackets. Functioning like a soft-shell with its excellent waterproofness (HH 20,000mm) and great breathability, yet comfortable and stretchy like a light-weight active layer. The 4-way stretch fabric moves with your body during forward motion and works well with the Dry.Q Active fibres which release water vapour produced from heat generated inside the jacket. The 2.5 layer system is light weight and compressing perfect for backpacking and the 40D exterior is durable and resilient. The Stretch Ozonic is a waterproof alpine jacket which will push you further up the mountain.