- Product Name: Koshiretch - Brand: PROIDEA - Size: 15.5 x 12 x 7cm - Weight Capacity: 100kg - Material: ABS, Polyurethane PROIDEA Koshiretch This is a cushion for sacral stretch. Use it by placing it on your sacrum while lying on your back. It's a stretching item that gently stretches the lower back area. Use it for about 3 minutes a day, during relaxation time or before bed. *This product is not a cushion to be used while sitting. *Please note that it is not suitable for use as a lumbar support on chairs or car seats. Please purchase only if you understand that this is a used item and has been stored at home.