The Altum Mode Modular Jacket is constructed to lock up the heat when the temperature drops. The modular design allows you to combine the jacket with an extra layer, the The Trek Path Modular, to create prime insulation for when the elements are against you. Storm Placket, buttoned hand pockets, chin guard protector, top-end waterproofing and breathability. Made with 48% REPREVE recycled polyester as part of our O'Neill Blue product range. Please refer to Our Ocean Mission page for more information about the materials used in O'Neill Blue products. Altum Mode Modular Jacket | Black Out