Supports Patient's Spine by aligning it on wilson frame and WFP provide extreme elastomeric cushioning with added protection from shear & pressure. WFP is provided alone and not with Wilson frame. Prefixed on frame with hoop & loop attachment used frequently in Neurological & Orthopaedic prolonged surgical procedures Item Size Dimensions (mm) WFP-M Medium 660 x 100 x 12 WFP-L Large 750 x 255 x 12 WFP-L-F Large 750 x 255 x 12