MMA Grappling GelTech shin guards - Covered Back. for MMA, Muay Thai, Kickboxing Gel padding on shin bone area providing maximum protection available in market. Covered Back. One of a kind shin instep protection designed specifically for the grappler. Neoprene support secures the guard to the feet and shins. Inner foam provides necessary leg protection. Neoprene support also covers calf area. Medium fits up to 140 lbs. Large fits 140 to 185 lbs. XL for 185 lbs. plus.