The stratus is an ultralight cushion, designed to reduce energy expenditure and preserve joint integrity as the user self propels.  Use the valve to release some of the air in the cushion to immerse the user into the foam.  The users weight is then evenly distributed over the surface of the cushion.    Users value the stratus as a low weight, slim profile and comfortable cushion. Fabric The stratus foam is a bonded nylon fabric for strength and durability.  The stratus is available with a mesh or incontinence cover with breathable two – way stretch material which is completly waterproof(please select when ordering).  Reticulated foam underneath promotes air and water vapour exchange and improves pressure distribution.  The underside of the cushion is a rugged non slip material with a hook and loop added for security.  Machine washable.  Valve The stratus uses a VARILITE two-way air valve.  Sitting on a fully inflated cushion, the user opens the valve and releases some of the air until comfortable.      Please select your size below. Quantity 12345678910 Price (ex VAT): £158.51 Price (inc VAT): £186.25 Options and Accessories Please choose your cushion size.: 12 x 12 12 x 14 14 x 14 14 x 16 16 x 16 16 x 18 17 x 17 18 x 16 18 x 18 20 x 18 20 x 20 Please choose your cover type: Incontinence cover Mesh cover