Material: This knee pad is made of nylon, spandex, silk latex, non-slip silicone. The fabric is comfortable, breathable and cool to ensure knees are protected and comfortable. Fits a leg circumference of 16.5 to 18.5 in (42 to 47 cm). Note: It is recommended to wash by hand or machine on delicate cycle at 30C, air dry, do not use detergent or bleach Non-slip design: the upper edge of the knee pads is equipped with a silicone anti-slip strip to increase the grip of the knee pads and reduce slippage. During sports or fitness, your knee pads will always stay in place without slipping, providing perfect support and protection for your knees. Portable interior design: The knee pads are breathable, lightweight and feel free. If it will adapt to the body to protect you, you can wear it outside with jeans or your favorite suit without any discomfort. Comfortable fit is why many people love and choose Milaine knee pads. Application: Our knee pads are suitable for most indoor and outdoor sports, such as running, basketball -ball, football, baseball, cycling, tennis, hiking, volleyball, skiing, squats, weightlifting, fitness and more.