Precision Medical Inline Hydrophobic Filter, 1 Each Electrical Supplies Poly cotton bound foam and Campylobacter Poly cotton bound foam and lined with nylon tricot * One each medial and lateral stay and three contoured posterior stays are all removable * Hook Loop closure * Fits sizes: 10 to 14 (Circumference 3 Above Knee) 6 Healthcare grade deluxe elongated open front seat enhances resident comfort * Anti slip handgrips * Fast drying removable mesh back sling * Reinforced at all stress related areas * Outriggers help prevent unit from tipping over * 360 Degrees * outrigger for safe & stable swivel movement * Dimensions * Internal width: 18 * External width: 22 * External depth front to back at bottom section of outriggers: 31 Diameter of filter is 57 millimeters its viral filtration efficiency (VFE) is 99