Unique visco wave upper surface combined with high density foam that distributes pressure more evenly. The visco wave cushion has been designed for use in a wheelchair or chair, by users in the low/medium risk category. Supplied with a removable cotton cover. Size 420 x 420 x 75mm (16.5 x 16.5 x 3"). Weight 2kg. Maximum user weight 75kg (11.75 stone).