Are you tired of sitting on those rock hard chairs and want something more comfortable and friendly to your spine? Yes? Then the Sit 'N' Gym Perla is the ball for you. The ball has little “feet” to prevent it from rolling away when used as a sitting ball. It is used in classrooms, offices and at home or when sitting in front of a computer. It promotes dynamic sitting that improves blood circulation and correct posture. The super strong latex-free vinyl material is burst resistant and is able to with stand up to 600 lbs.

Its availability ranges in sizes : 22" ( 55 cm ), 26" ( 65 cm ), 30" ( 75 cm ) in diameter. Refer Ball Size Guideline Chart.