Ion K-Pact Zip Knee Guards The K-Pact Zip builds off of the successful and award-winning K-Pact platform, with a Quick-E side zipper for easy put on and take off-even while wearing shoes. The K-Pact Zip features a proven sleeve construction for a great fit, utilizing the Super Perforator Neoprene material to provide you with maximum breathability even through the toughest of climbs. The SAS TEC Main uses 3D-protectors made of visco elastic soft foam with an incredible shock absorption quality, for the best level of protection from impacts. All these features make the Ion K-Pact Zip Knee Guards your ideal choice for the trails, bike park, and high-speed descents! Features Quick_E zipper: A fully integrated zipper opens the protector sleeve from top to bottom. Super Perforator Neopreneoffers excellent breathability and durability SAS-TEC Main Padding originatesfrom motorcycle technology for excellent impact absorption Sizing Knee Guard Size Small Medium Large Extra Large Circumference above knee14. 8 - 16. 5"16. 5 - 17. 4"17. 4 - 18. 3"18. 3 - 19. 2"Circumference below knee13. 2 - 14. 2"14. 2 - 15. 1"15. 1 - 16"16 - 17. 4" | Ion | K-Pact Zip Knee Guards Men's | Size Medium In Black