Corrects posture. 【Used by that famous major leaguer who suffered from poor health】The sacral pillow is a tool that makes your body feel refreshed by addressing the area around the spine, including the sacrum. 【Unique shape tailored to each part】The unique shape of the sacral pillow is designed with the shape and hardness to accurately address each part. (About as hard as a tennis ball) 【Three basic ways to use it】By using different sides of the pillow depending on the area, you can easily loosen the muscles from the sacrum to the neck. 【Also used by top athletes】The sacral pillow is also used by many top athletes.