The Gymnic Movin\' Sit allows users of all ages to practice correct muscle activation to promote better core stability and posture. The fitness cushion is designed in a wedge shape to encourage activation of intrinsic trunk muscles to support a good posture. The cushion itself has precision placed nodules, designed for massage and grip to enable exercises to be carried out safely and effectively. The Gymnic Movin sit\' is a great piece of fitness equipment which all the family can use. The smaller version of the Movin’ Sit inflatable wedge is designed for children as it fits perfectly in the small chairs of kindergartens and primary schools. Movin’ Sit Jr. helps children maintain proper posture through dynamic sitting. Consequently, kids’ awareness and focus during learning time will improve. Through inflation/deflation, you can adjust the stability of the product. Adult Movin’ Sit inflatable wedge Size: 36 x 36 x 7 cm Class I Medical Device compliant with European regulation. Product specification. Recommended weight: max. 120 kg (270 lbs) / Tested load capacity: max. 200 kg (440 lbs). Junior Movin’ Sit inflatable wedge Size: 26 x 26 x 7 cm Class I Medical Device compliant with European regulation. Compliant with European (EN 71) and US (ASTM) safety regulations. Recommended age: years 3+. Recommended weight: max. 45 kg (100 lbs) / Tested load capacity: max. 200 kg (440 lbs).