M:19.5*53.5CM (a single one) L: 23*57.5CM (a single one) Upgraded Open-Patella Design:This knee support comes with popular open-patella design and built-in silicone pad,which can provide targeted compression support and help reduce pressure on the knee-joint during exercise.Besides,it can help increase stability and improve comfort,suitable for users whose knee is 12~18inch in circumference. Non-slip Knee Support:Our knee brace has adjustable triple velcro straps that can be attached to any exterior point of your knee,helping you easily adjust tightness and remain stable support.Meantime, the built-in double-sided spiral spring strips and non-slip grip design also ensure knee brace stay in place during flexion and extension, no more worry about sliding down during exercises. Comfortable&Breathable:The 3D knitted fabric is perfectly combined with highly breathable neoprene material, so our knee support is comfortable to wear,no rubbing.It also has good breathability which can help encourage blood circulation as well as drain sweat in time to keep your leg dry and odor free,so you can wear it for a long time without discomfort . Knee Protection: This knee brace can fully support the knee joint during exercise,tighten the muscles to avoid sports injuries,and support you in all-round exercise.Even if you are doing strenuous exercise, it can also provide you with enough protection to avoid knee injuries. Enjoy Your Activities:knee pad is very suitable for you to wear in sports and daily leisure activities,such as baseball,basketball,football,gym,hiking, running,tennis,volleyball and more.