adidas 2 in 1 convertible running jacket, men's US size medium. The jacket converts into a lightweight running vest with zip off sleeves. There are two zip pockets on the front and a accessory/ valuables zipped compartment on the back. The back pocket will hold a cell phone, IPod, wallet, car keys, etc.... This jacket is windproof, water resistant and has glove cuffs on the sleeves for added warmth when needed.