Used by all 12 professional baseball teams in Japan, and over 200 NPB and MLB players! Also adopted by the Fukuoka SoftBank Hawks. Baseball-specific belt x supporter "Core Energy" The condition is good as it hasn't been used much. There are almost no marks from the holes. Approximately 100 cm to the largest hole. For adults ■ Belt Color Royal Blue ■ Buckle Color Silver (SI) ■ Size Length 120cm (Free Size) / Width 4cm ■ Materials [Main Body] 76% Nylon, 24% Polyurethane [Leather Part] Synthetic Leather [Buckle] Iron ■ Country of Origin Japan ● Compatible with high school baseball rules (Navy) ● Reduces the burden on the lower back and improves the performance of athletic movements. ● Recognized as a supporter function belt structure and has obtained a patent. ● Developed by a former professional baseball and major league trainer, and recommended by sports doctors. Core Energy is a baseball-specific belt developed by a professional baseball sports trainer. Supports the "transverse abdominis" muscle, known as a natural corset. When the transverse abdominis, which spans the upper and lower body, can be used efficiently, a connection is created between the upper and lower body. When the connection increases, you can exert more power that you usually unconsciously save. By expanding the range of motion of the joints, the "sharpness" of movements like "throwing" and "hitting" is enhanced. Core Energy was developed with the concept of "how to support" the transverse abdominis, which is the starting point of such movements. In baseball, where there is often a forward-leaning posture, the belt around the waist often floats. That means power loss is occurring. Therefore, Core Energy uses power mesh with excellent elasticity and durability. It always fits the body like a corset in any posture and draws out power. ※ Tightening it tightly will exert more power, but there have been reports of injuries due to the increased range of motion and excessive movement. Even if you are seeking a higher effect, we recommend tightening it gradually.