As you watch your kids play their game on the field or court, you remember when you used to play sports. Maybe you don't have kids but you remember the feeling of competition and how fun it was. What a rush! Well with that level of competition also comes risk of injury. Here we have a pair of knee sleeves that may be able to help prevent injury. They are made of neoprene material and have reinforced stitching. They help increase performance by offering compression and support. They are a great choice if you have an old nagging knee injury. Knee sleeves and braces aid in rehabilitation therapy and faster muscle recovery. I personally use them in the gym during weight training. I have a love for the steel. They're a very useful tool when performing squats and leg presses. You will commonly see knee sleeves used in baseball, basketball, bowling, crossfit, cycling, dance, football, golf, gymnastics, hiking, hockey, jogging, jumping, MMA, powerlifting, running, skiing, strength training, soccer, tennis, volleyball, weightlifting, wrestling, and the list goes on. They retain some of your body heat which will keep your knee joints warm and may offer some soothing pain relief if you have arthritis or tendonitis. Hey no fancy words here, but if you want a pair of dependable, well constructed knee sleeves that are comfortable and supportive yet flexible, give these a try. They are available in multiple sizes. They are easy to use and easy to clean. If they are not what you need, return them. I would also like to remind you that Healthy Nutrition and Exercise will always help you achieve your fitness goals and perform better. Keep a Winning Attitude and a Champion's Mindset! Positive Energy! Small 11.8"-13"... Med 13"-14.2"... Large 14.2"-15.7"... X-Large 15.7"-17"... XX-Large 17"-18.3"... XXX-Large 18.3"-20"