McKesson Molded Foam Seat Cushion, 20 x 18 x 3 in, 1 Case of 4 Housekeeping Adjustable Flow Regulator Easy to turn knob Hip Kits Adjustable Flow Regulator Easy to turn knob conveniently placed directly below gauge for easy use and control Knob has safety lock feature which will not allow the knob to be twisted off Black * Extra wide for broader backs: Men's size 44+ and womens 18+ * Designed to increase comfort by aligning your spine and supporting correct posture * Unlike traditional L shaped chairs the S shaped frame of the Obusforme molds your spine into proper anatomical alignment * Muscles relax leaving you more comfortable and energized * Features molded impact resistant lightweight polycarbonate frame * Durable polyurethane foam protects frame and provides cushy comfort * Hypoallergenic cover can be removed and spot washed * With removable adjustable lumbar support pad to provide additional comfort for the lower back by supporting the lumbar curve * Use together with any Obusforme seat * Beautiful impact retail packaging *Obus Forme Wideback cushion are 19Ã x 7Ã x 21 Gel bladder designed to eliminate gel migration to maintain balanced pressure redistribution stretch nylon cover is breathable