Tethrd Knushion XT Provides 4x more cushion than the previous version;15 percent lighter than the previous version for improved portability;Concave wings conform to the tree and lock in knees to reduce fatigue;Made from lightweight and durable foam;Easily attaches to the tree with included bungee hooks;Weight: 4.1 ounces;Dimensions: 12.5? ? 6.5? ? 3?