The New Knee Pro Hybrid Ultra Flex III offers all the same legendary features as the Knee Pro Ultra Flex III pad but has the added advantage of a built in GEL pack for added comfort and fit. This is the ultimate knee pad for extreme applications where users are on their knees for extraordinary long periods of time. Unlike many GEL pads on the market, our GEL packs are securely placed inside a three layer, 3/4" closed cell foam knee protector compartment and guaranteed to stay leak-free.