Ion K-Pact Select Knee/Shin Guards The Ion K-Pact Select Knee/Shin Guards offers the best protection but at the same time enables you to pedal uphill effortlessly. Their patent-pending ION Tectonic Fit features overlapping and sliding protection panels to keep the pad close to your knee at all times while maintaining freedom of movement. You can depend on great breathability thanks to the Super Perforator Neoprene and added protection from the asymmetrical side padding, which is famous for its cushioning characteristics. Features Patented Tectonic Fit: Guarantees maximum freedom of movement when pedaling. Super Perforator Neoprene:Very flexible and robust neoprene with superior breathability. SAS-TEC Main Padding: made of visco elastic soft foam with incredible shock absorption values. Sizing Knee Gaurd Size Small Medium Large Extra Large Circumference bottom cycle11-11. 4"11. 8-12. 2"12. 6-13"13. 4-13. 8"Circumference top cycle16. 5-17. 3"17. 7-18. 5"18. 5-19. 3"19. 7-20. 5" | Ion | K-Pact Select Knee/shin Guards Men's | Size Large In Black