Wider spread between the "removable" lumbar and seat pads, plus the ultra heavy nylon web, double box-stitched waterproof Lycra polyester cover and the liner is made from synthetic terry cloth, which wicks moisture and has enough "tooth" to keep the harness from slipping. Included is a mesh bag with grommets for rinsing the harness with fresh water and easy storage and is completely synthetic and machine washable.