The SISSEL Posture Shirt is an innovative aid to support healthy posture. It was developed to promote an upright posture and at the same time activate the muscles. The shirt is made of an elastic, breathable material that gently pulls against the back, helping to bring the shoulders into a natural, ergonomic position. When the shoulders are in an optimal, retracted position, this leads to activation of the core muscles, which supports and promotes correct posture both when sitting and standing. The shirt's Posture Alignment Technology constantly reminds you of your correct shoulder and upright sitting posture. Available in 4 sizes each for men and women. The internal material reinforcement on the back gently reminds the upper body of an upright posture.