This is a lightweight vest (weighs 2.3 oz = 65 gm) made of a laminated rip-stop nylon. It is windproof, water-resistant, warm, and extremely light weight. This combination keeps your core warm on chilly rides and fast decents, yet allows your body to breathe on long climbs. Rather than having a mesh back like most cycling vests, it is rip-stop so it works great for cycling and running. It features a YKK® molded full front zipper with a high-neck. This vest compacts to the size an Altoid box.