Superior wave upper surface with a high density foam insert, which offers greater cushioning to the coccyx. The vertex cushion provides coccyx protection at the base of the spine with an integral safeguard foam insert. Designed for use in a wheelchair or chair by users in the low/medium risk category. Size 420 x 420 x 75mm (16.5 x 16.5 x 3"). Weight 2kg. Maximum user weight 75kg (11.75 stone).