So light you won't notice you're wearing it, and highly packable, the Windveil Pull-On is a great choice when you need wind protection with no weight penalties. The material breathes much better than waterproof fabrics - it actually has controlled air permeability with a CFM reading of 1 (cubic feet of air passed through one square foot per minute). The half-length front zip has a nifty snap connector: you can ventilate via the length of the zipper without having the jacket flop around uncontrollably. You can also pull the jacket down to your waist, if the clock is ticking and you don't want to take the jacket off entirely. - Made of 20 denier Pertex Quantum Air polyamide, 47g/m² - Extremely breathable Motiv Aero stretch panels in areas prone to excessive sweating - Very fast drying, moisture transfering - Half-length zipper - Hidden pocket for keys, gels or cards - The jacket can be packed in said pocket - Hem adjustment - Elastic cuffs