Simply set it on your chair! Supports your pelvis and makes sitting comfortable! A cushion that naturally straightens your back using the height difference between the front and back. It can be secured with a belt, so it can also be used as a waist cushion (lumbar support) or a headrest support cushion. Also great as a pillow for naps! It has the characteristic of stretching up to approximately 45cm, so you can fit it to the shape of your buttocks by stretching it while sitting. Recommended for those who do a lot of desk work, those who suffer from shoulder and back strain, and those who want to sit with good posture. (Photos 8-13 are quoted from the internet.) I received this as a free gift when I was given another cushion as a present, but I'm selling it because I don't have a chance to use it. *Although it has been used very little, it has been stored at home, so please only consider it if you understand this. -Size: Approx. 25 x 17 x 3-9cm -Outer fabric: 90% polyester, 10% polyurethane -Filling: Powder beads (expanded polystyrene) -Belt part: 75% polyester, 25% polyurethane -Product weight: Approx. 115g -Made in Japan ◎Immediate purchase OK ◎Anonymous shipping Thank you for looking.