Gel Convoluted Foam Cushion 18 x 16 x 3 Navy Leg Positioners Provides optimal 30 degree angle of vitamins and minerals compared Provides optimal 30 degree angle of incline for relieving pressure on hipbone and coccyx * Wedge is comfortable high density foam * Breathable low shear 4 way stretch cover with antimicrobial protection requires friction * Slip resistant bottom prevents sliding Vacuum Range: 80 550 mm Hg * High density convoluted foam promotes air circulation and combines with a dual chamber gel pod providing superior pressure relief and comfort * Low Shear anti microbial and fire resistant fabric all incorporated into one fluid proof removable cover * Slip resistant bottom with Velcro© straps help keep cushion in place * Meets CAL 117 standards