WINOMO Sunglasses Safety Holder Eyeglasses Anti-slip Elastic Silicone Headband Strap Color: 5 colors. Material: durable soft elastic silicone. Total length: 22cm. Hole size for glasses legs: 0.9cm*0.2cm. Elastic silicone strap design, make it suitable for both adult and children to wear. Installing the anti-slip strap on your glasses legs and wearing it on your head, can effectively prevent your glasses from falling when you are doing sports. Notes: 1. The anti-slip silicone strap is more suitable for Acetate Glasses Legs, NOT for Thin Metal Glasses Legs, 2. It is applicable to the eyeglasses legs' tail width up to 6mm.