1Two spring straps are added on both sides to provide more powerful support and make your movement more effortsaving. 2Provides extra stability and support to the knee, stimulates blood circulation, and improves sports performance. 3Fit tightly to your knees and is easy to extend without limitation, you can wear it all day without feeling uncomfortable. 4Nonslip and elastic fabric to avoid up and down sliding and tumbling during exercise. 5Suitable for all kinds of sports, such as running, horseback riding, hiking, playing basketball or football, etc.