Made of silicone, this item doesn't soak up sweat, get dirty, stink or fray. for walking, biking, hiking, climbing, snow skiing or just enjoying the great outdoors. Help provide kids with the protection and security they need to keep track of their glasses. Compact and light weight design provide a comfortable wearing feel. Good choice for your kids. Features - Color: Black. - Material: Silicone. - Silicone strap length: 20cm / 7.9inch. - The thickness of eyeglasses' leg end should be under 0.47inch. - Anti-slip Eyeglass strap and ear lock hook set for Children. - Reduces slippage and prevents loosing glasses from face, comfortable and secure for eyewear. - Made of silicone, doesn't soak up sweat, get dirty, stink or fray. - for walking, biking, hiking, climbing, snow skiing or just enjoying the great outdoors. - Compact and light weight design provide a comfortable wearing feel.