ACTIBALANCE (Acti-Balance) The secret to a beautiful, straight back. For those who unknowingly slouch in daily life, such as from smartphone use or desk work. This half-top supports the creation of good posture. ・Naturally supports a "straight back"! The cross panel placed in the back causes a slight discomfort when your posture deteriorates. By prompting awareness of your back muscles, it supports the creation of good posture. ・Breathable and comfortable. Uses highly breathable mesh and sweat-wicking, quick-drying materials. Product Number: JB6011N Materials: Polyester, Nylon, Polyurethane Features: Sweat-wicking, quick-drying Size: M