The Sero Pressure Cushion is made from high density foam to support & disperse pressure. The high profile foam helps eliminate numbness & relieves pressure points (see pressure map image) while the integral pockets allow air to circulate enabling heat to disperse. Select cushion size Standard for office and dining chairs, Armchair for sofas. Select cushion thickness; 10cm for those over 95kg. Product features: High density shaped foam for even pressure distribution & pain relief Handmade in Devon, UK Suitable for home, office, travel & wheelchair 2 year guarantee Purchased & recommended by NHS trusts Stretch, zipped, washable cover included (black/navy blue jersey & waterproof) Available in two thicknesses (thicker version for heavier individuals (95kg/15 stone+) & two sizes Helps heal & comfort: General comfort Sciatica Hip pain (arthritic hip joints & hip replacement) Bursa Pressure sores (when sitting for long periods) Nerve pain Standard 6cm: L42.5 x W41 x 6cm Standard 10cm: L42.5 x W41 x 10cm Armchair (Larger) 6cm: L49.5 x W48 x 6cm Armchair (Larger) 10cm: L49.5 x W48 x 10cm The recommended maximum weight for achieving the full benefits from our Sero Pressure Cushions is 115kg. We also offer cushions with cut outs to relieve pressure in specific regions. To purchase spare cushion covers please click here.