Manufactured with a 1 in (2.5 cm) EthaFoam base to provide a more stable seating platform and to correct sagging sling seats on wheelchairs. The polyurethane foam wedges are 3 in (7.5 cm) high at the front tapered to 1 in (2.5 cm) at the back. All come with a handy carry handle. Cushion measures 16 in (40.6 cm) in depth (from back to front) and 18 in (45.7 cm) in width.