The IncrediBack Moldable is best for the wheelchair users who need the support and comfort that a normal sling back cannot provide. Angle and height adjustable, the Incrediback is constructed of patented moldable aluminum stays that conform to and support users back. All models recline up to 30 degrees (must use anti-tip bars when reclined). Fully adjustable for angle and height, with 2" of depth adjustment. Quick and easy installation. (Wheelchair must have anti-tip bars). Comes in six different styles: Incrediback, Incrediback Rigid Back, Incrediback Deep Back, Incrediback Tall Back, Incrediback Rigid Tall Back, and Incrediback Deep Tall Back.