AliGel™ Overlay Patient Positioner Products remain an industry standard due to the pressure-relieving properties of a unique gel formula that mimics fatty tissue and moves with the patient to reduce shear and help prevent pressure injuries. Additionally, AliGel patient positioners and overlays absorb shock, stretch, and retain their shape better than less dense gel patient positioners. AliGel overlays are made of 100% dry viscoelastic polymers.