Designed for the active resident, this cushion encourages proper posture and helps decrease pressure. When used with a reclining back, it helps redistribute pressure from ischial area to the back. The weight capacity is 250lb. It is made with two layers of high resiliency foam. The gel pad is positioned between the two layers. The gel is in 4 chambers to help keep it equally distributed throughout the cushion. The cover is shearX cover that helps reduce heat build-up and sheering. Available in three sizes: 16 x 16, 18 x 16, and 18 x 18. This item is drop shipped directly from the manufacturer abd is a 7-10 business day delivery.