This wedge-shaped seat cushion tilts the pelvis forward, improving sitting posture and relieving lower back strain. The cushion is filled with air and has a side with nodules and a side without. The nodules stimulate blood flow. For a smaller size (suitable for children), see the Movin' Sit Junior. Specifications for the Movin' Sit Senior seat cushion are as follows: – Suitable for older children and adults – Dimensions of the seat cushion: 36 x 36 cm – Maximum weight: 120 kg – Color: blue – You can inflate the cushion with your mouth.