Special shape covers shoulder, collarbone and over the top of the shoulder for sitting, bench, prone and off hand. If you thought you couldn't comfortably take the recoil of the larger calibers this will change your mind. I personally use these with all my shooting including my 50-90 11 lb. rifles. Even after firing 200 rounds in the prone position over three days of competition there was NO discomfort. No shooter should be without one. Be sure to specify right or left hand and chest measurements. Small fits up to 42" chest, medium 40"-48", large 48" and up. These stay in position well for fit, comfort and function.