YT Trail Knee Protection Unisex Breathability, Comfort, and Protection With the YT Trail Knee Protectors, you choose all three. These pads are engineered to meet the demands of flat-out, all-day trail riding and feature flexible D3O Ghost inserts to shield you when you next hit the dirt. They're lightweight and high-stretch, feature breathable inserts to enhance airflow, and feature silicone grippers for a secure fit. You can even remove the D3O insert for easy cleaning, so there's no excuse for stinking up the van on the way home. Features D30 Ghost knee protector offers high-flex, low-profile, CE level 1 protection Minimalist, high-stretch design with lightweight materials Breathable mesh inserts optimize airflow Sizing Size Small Medium Large Extra Large Thigh Circumference48 - 51cm / 18. 9 - 20. 1"51 - 54cm / 20. 1 - 21. 3"54 - 58cm / 21. 3 - 22. 8"58 - 62cm / 22. 8 - 24. 4"Calf Circumference32 - 34cm / 12. 6 - 13. 4"34 - 37cm / 13. 4 - 14. 6"37 - 39cm / 14. 6 - 15. 4"39 - 41cm / 15. 4 - 16. 1" | Yt | Trail Knee Protection Unisex | Size Small In Black