Coccyx Cushion Foam 18 x16 x4 Black Modular Seating Offers soothing relief * All stretchable sides so you Offers soothing relief * All natural ingredients including menthol and MSM * Available in gel spray and roll on applicators * Temporaty relief of minor aches and pains of muscles and joints associated with simple backache arthritis bruises strains and or sprains * Water based formula minimizes grease and residue * The result Polar OwnIndex evaluates your maximal oxygen uptake (VO2max) 75 Up Charge) * Relieves pressure at the sacral area while offering patient s comfort and even distribution of weight throughout the cushion * Medium density fire retardant foam is covered in either a poly cotton in your choice of black navy or gray medical grade vinyl Black * 18 W x 16 D x 4 * Custom sizes available * Optional solid seat inserts available ($8