Geo-Matt Contour Cushions with Antislip CoverAnti shearing layer on top and firmer contoured base below creates ideal positioning and effective pressure redistribution in one cushion Base features contoured leg channels, abduction adduction build up, and pelvic bucketing to help discourage slouching Standard cover consists of anti slip top surface and non skidbottom Built in sleeve in bottom of cover allows use of molded Sling Fill base (not included) 3" height; 250 lb. weight limit 1 each LATEX