Package:You will receive 4 pieces of adjustable black glasses straps,enough for your daily use and replacement.The anti-slip feature ensures that the cord stays put, even during intense activities, so you can wear your glasses with confidence.The anti-slip adjustable eyeglass cord is a must-have accessory for anyone who wants to keep their glasses safe and secure. Premium material:the sunglasses holder made of high elastic silicone and soft polyester fabric meterial,they're so comfortable to wear that you might forget you're wearing them. the tough but soft and pliable leather will not fray or break easily of them, can serve for long time of this sports glasses strap. Hand Wash Fastening: Adjustable Classic TJYJDHS01LSUK Adjustable Size:You need to pull the adjustment buckle to adjust the length of the glasses straps (extension range: about 8.2-13.5inch/20.8-34.29cm) according to your needs so that the glasses will not fall.Easy to Use,you can insert both end of strap into your glasses frame, appropriately move eyewear strap to find the right wearing position. Convenient And Practical:When you are not wearing glasses, the glasses neck strap can fix the glasses on your neck. You don't have to worry about losing or not finding them when you are outdoors.In addition,glasses cord is comfortable to wear without stress, you might forget you're wearing them. Application:Floating glasses strap is perfect for sports,such as running, hiking, fishing,swimming, biking and other outdoor activities,In beach, strap can keeps you from losing the glasses in a sudden burst of surf at the beach.Also in the daily life of using glasses,Black glasses cord fits for man and women, can match to different clothes.