Size Information: 1) Small = 5-12 years old = Fits an 9.8"-11.8" knee circumference= Elbow circumference 8.6"-10.2" 2) Meduim = 12-16 years old =Fits an 11.8"-17.0" knee circumference= Elbow circumference 10.2"-12.2" 3)Large = 132-165 Lbs adult women men Specifications: 1) Material: Nylon, rubber thread 2) Weight: 0.22 LB 3) Three Colors: Black,Grey,Pink 5) Package: 1 Pair of Knee Pads,1 Pair Elbow Support Features: 1) Comfortable fabrics are in good contact with your skin, making it breathable rather than sultry. 2) Ergonomic design, easy to put on and take off, they can fit tightly to your kids' legs and elbows 3) Effectively reduce the risk of injury in sport and avoid unnecessary injuries and pains. 4) Provides strong support for the knees&elbow and prevent further knee swelling, torn muscles and ligaments or inflammation. 5) High performance elastic fabric. tightly fixed in the legs&elbow, not easy to slip when in sport,It keeps you protected against impact injuries 6) Suitable for all kinds of indoor or outdoor activities, such as volley, gardening cleaning, basketball, handball, cycling, riding and etc.PACKAGE INCLUED: 2 Pair(4 pcs).knee and elbow sleeve designed to help to keep warm, provide muscle support, alleviate knee and elbow pain symptoms,swelling, protect and help reduce the incidence of injury and impact. OCCASION:Perfect for most sports activities like jogging, running, dancing, football, basketball,volleyball, skating,cycling,sports and more. joint pain relief and injury recovery,very effective avoid bruise and arthritis. STRETCHY & FEXIBLE:Stretchy,breathable,comfortable,lightweight and protective,protects knees and elbow against scrapes,tightly fixed in the legs and elbow, not easy to slip when in sport Soft fabric allows greater flexibility motion, you kid need a pair of knee & elbow support cover in summer when they wear short pants. BREATHABLE & SKIN-FRIENDLY:This knee and elbow pad set is made of high quality Nylon, rubber thread, our knee pads are soft, flexible, non-slip,moisture wicking, comfortable and no sense of bondage. Keep kids' knee warm in cold weather and promote blood circulation. SIZE DETAIL:S(5-12 Yrs) Fits an 9.8"-11.8" knee circumference,Elbow circumference 8.6"-10.2"; M(12-16 Yrs) Fits an 11.8"-17.0" knee circumference,Elbow circumference 10.2"-12.2".Large Size:Suitable for 132-165 LBs adult,this knee protector set is adjustable and easy to take off and wear with the stretchy material.