Material: Polyester;Length: 23cm - 33cm/9.06" - 12.99" (Approx.); Width: 1.2cm/0.47" (Approx.) SECURELY RETAIN - Snugly fit and tough, can securely keep your glasses on, no more worry about the glasses slide off the nose when sweaty or looking down. Perfect for those who wear glasses while running or kids with glasses playing sports. SOFT & LIGHTWEIGHT - Ultra comfortable, very soft on the ears and nicely keep glasses on during sports or rough boy play. It is flexible enough for you to slide glasses off your eyes while reading/doing close up stuff. QUICK DRYING - Soft polyester material, quick drying and keeps you from losing the shades/glasses in a sudden burst of surf at the beach. Perfect for the water/amusement parks, beach or anywhere you're afraid you might lose the glasses. 【Application】Perfect for outdoor sports and daily life. Ideal for fishing, biking, hiking, rock climbing, and snow skiing or other sports enthusiasts.