G-Form Terra Knee Guard Totally Eco Friendly Knee protection can be important if you're riding aggressively out on the trails. With an added layer of protection, you'll be able to ride harder with more confidence. The G-Form Terra Knee Guards are G-Form's first product using all-new eco-friendly technology. The RE ZRO padding is fully biodegradable and 100% recyclable. The RE ZRO pad is pre-curved for an ergonomic fit. It features compression mesh on the lower interior panel that provides both support and airflow, a two-piece construction on the interior of the sleeve for friction-free movement, an abrasion-resistant covering for increased durability, and a wide, silicone-printed top gripper for increased comfort while keeping the guard in place while you're riding. Features RE ZRO pad that is fully biodegradable and 100% recyclable Two-piece construction on the interior of the sleeve allows for friction-free, full range of movement Abrasion-resistant covering for increased durability Sizing Size Extra Small Small Medium Large Extra Large XX-Large Measure Thigh 8" Above Kneecap16. 5 - 18"18 - 19"19 - 20"20 - 21. 5"21. 5 - 23"23 - 25"Measure Calf Around Widest Part11 - 13"13 - 14"14 - 15"15 - 16"16 - 17. 5"17. 5 - 19" | G-Form | Terra Knee Guard Men's | Size Extra Small In Black