The Tethrd Knushion XT that has 4 times the cushioning power over the previous version to make you comfortable while you wait for a booner to walk by. The concave wings of the Knushion XT allows it to conform around the tree while locking in your knees to prevent them from sliding off the Knushion and greatly reducing fatigue. FeaturesConcave wings to reduce fatigueEasily attach to the tree with the included bungee hooks4x more cushion than the previous version15% lighter than the previous versionWeight: 4.1 ouncesDimensions: 12.5" x 6.5" x 3"