Seat wedges are shaped foam cushions which are designed to use on office chairs, dining chairs or car seats to open the angle between body and upper leg. Sitting with the legs at 90° or less to the body causes strain in the hip joint. This is relieved by a backward rotation of the pelvis. This in turn flattens out the natural inward curve (lordosis) of the lumbar spine, putting increased pressure on the inner serfaces of the lumbar disks in particular. Wedges can help to reduce this problem by encoraging a more open angle between body and upper leg.
Seat wedges come in a variety of sizes, angles and foam densities. 8° or 9° wedges are the most commonly supplied, particularly for cars and upright chairs. Wedges which are greater than about 9°, particularly on dining or office chairs, tend to make sitting uncomfortable because of the tendency to slide forwards off the seat.
Other seat cushions are available for a variety of purposes, mainly pressure relief. We can supply a selection of cushions of this type with assorted cutouts for specific zones of relief, such as the coccyx, perineum or for post-natal use.
Dimensions given are W (width side to side), D (depth from front to back) and T (maximum thickness at the back of the wedge or the thickness of flat cushions).




The 8° wedge is the most popular of the wedges that we supply. The rounded back corners make it ideal for car seat use. Very hard wearing velour upholstery in black, grey and some variations as well.
Product Code: 4211.02
Dimensions: W:37cm; D:36cm; Max T:7cm
Price inc VAT: £29.50
Price ex VAT: £25.11




The coccyx relief version of the 8° wedge above features a pressure relief channel. The rounded back corners make it ideal for car seat use. Very hard wearing velour upholstery in black, grey and some variations.
Product Code: 4211.03
Dimensions: W:37cm; D:36cm; Max T:7cm
Price inc VAT: £29.50
Price ex VAT: £25.11




The 11° wedge is a slightly steeper version of the 8° wedge above, again with rounded back corners. Suitable for car seats where the seat cushion has sagged, is very steeply inclined back, or for drivers of shorter stature. Very hard wearing velour upholstery in black, grey and some variations.
Product Code: 4211.04
Dimensions: W:37cm; D:36cm; Max T:10cm
Price inc VAT: £33.00
Price ex VAT: £28.09




The coccyx relief version of the 11° wedge above features a pressure relief channel. The rounded back corners make it ideal for car seat use. Very hard wearing velour upholstery in black, grey and some variations.
Product Code: 4211.05
Dimensions: W:37cm; D:36cm; Max T:10cm
Price inc VAT: £33.00
Price ex VAT: £28.09




A budget 9° wedge in a zipped, mid blue, stretch polyester cover. A good starter wedge. Not as durable as the Putnam wedges but a good all rounder. The back corners are square but as the cover is zipped, you can always trim the foam to fit better into car seats.
Product Code: 4211.15
Dimensions: W:37cm; D:37cm; Max T:8cm
Price inc VAT: £16.50
Price ex VAT: £14.04




A steeper version of the 9° wedge. Generally too steep for car seats unless the seat cushion has sagged, is very steeply inclined back, or for drivers of shorter stature. Zipped, mid blue, stretch polyester cover only.
Product Code: 4211.16
Dimensions: W:37cm; D:37cm; Max T:10cm
Price inc VAT: £16.50
Price ex VAT: £14.04




The most popular of our coccyx relief cushions. This is not a wedge but a flat cushion with a large coccyx cut-out and tapered front edge to make it comfortable for car use, but it is equally at home on an office chair, dining chair or theatre seat. Integral carry handle. Only available in black.
Product Code: 4211.26
Dimensions: W:39cm; D:37cm; T:6cm
Price inc VAT: £30.95
Price ex VAT: £26.34




A firm, viscoelastic, flat seat cushion with a tapered front edge. Good for heavier body weights to relieve pressure whilst sitting on firm seating. Can be used in cars but is generally better suited for chair use. Only available in dark blue.
Product Code: 4211.23
Dimensions: W:40cm; D:40cm; T:5cm
Price inc VAT: £51.00
Price ex VAT: £43.40








A range of pressure relief cushions, available as a standard non cut-out version or with a variety of cut-outs to cater for different pressure problems. Zipped, mid blue or black, stretch polyester cover.
Product Codes
Standard Sero Cushion: 4211.07
Coccyx Sero Cushion: 4211.08
Dr Huff Sero Cushion: 4211.09
Bonyparts Sero Cushion: 4211.10
Dimensions: W:41cm; D:42.5cm; T:7.5cm
Price inc VAT: £20.50
Price ex VAT: £17.45
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If we can do any more to help you, please call us on +44 (0)1752 893414 or email us on sales@backcentre dot co dot uk.
With thanks from the Back Centre team in Ivybridge, Devon.