The Windveil, made of Pertex Quantum Air, packs to the size of a tennis ball and offers wind protection. The fabric has an air permeability nuber of 1 cfm, helping avoid a sealed-in feel. Back pocket doubles as a packing pocket. - Slim fit - 20 denier Pertex Quantum Air fabric, 47g/m², air permeability: 1 cfm - Pits with Motiv Aero mesh with anti-odour treatment - Main zipper is accompanied by a snap-on tab, enabling ventilation via the zipper without having the jacket open all the way up - Hem adjustment - Protective collar - Stretchy cuffs