---100% Polyester fabric provides superior wind protection and water resistance ---Mesh panels fabric design the back keeps good VENTILATION ---2 Hand Pockets & 1 Back Pocket with zippers securely keep your belongs ---Zip-off sleeves and shoulder yoke easily convert the jacket into a vest; Sleeve zips can be partially undone for additional venting ---Jacket can be packed small enough to be stored in the back pocket; two hand zippered pockets securely store your items like 5.5" mobile phone.