Description of The North Face Mammatus Jacket For those who choose purity in mountaineering The North Face Mammatus jacket is perfect. Developed specifically for alpine climbing it features a seam sealed waterproof GORE-TEX Pro 3L Pro Shell with a performance fit. Four front pockets designed for easy accessibility during rough conditions make The North Face Mammatus jacket is a must have for mountaineering. The North Face Mammatus jacket is the premier waterproof, breathable, hard shell built with Gore-Tex Pro Shell, specifically for alpine climbing. Features: Body: 40D 107 g/m² (3.2 oz/yd²) Gore-Tex Pro 3L - 100% nylon ripstop micro-grid woven backer Abrasion: 70D 150 g/m² (4.4 oz/yd²) Gore-Tex Pro 3L - 100% nylon plain weave 30" length 600 g (21.2oz) Performance fit Waterproof, breathable, seam sealed Fully adjustable, helmet-compatible drop hood with hidden cord locks and laminated brim Laminated tricot collar for comfort PU zippers Two Napoleon pockets Two alpine pockets Pit zips Non-abrasive molded cuff tabs Waist cinchcords in pockets Hideaway hem cinchcord