The Keyhole Support Wedge is designed to take the weight off the user's body contact points (ischial tuberosities) and along thighs. Tender parts are left free and no pressure on the perineum means patient comfort is assured. The two-way relief wedge that doesn't let you down! Features unique symmetrical aperture that relieves pressure on tender parts. Support and comfort where it counts. The Keyhole Wedge Cushion uses the anatomically desirable 9 degree seating angle which encourages correct pelvic tilt to reduce pressure on the lumbar discs, thus minimising potential back problems. When reclining in bed, a bonus for keyhole is that it can be turned around so that the thin edge is gently tucked under the buttocks. This prevents the user sliding down the bed and takes considerable pressure off the lower spine.