Material: durable soft elastic silicone

The elasticity is super good, normally can be pulled to 19inch (50 cm) or more.Suitable for adult or child.​

Fit most sunglasses frames except metal thin glasses .

Soft and comfortable, adjustable and anti-slip, simple design, easy to use.

Effectively prevent glasses falling off when doing sports and outdoor activities;

Ericotry 3PCS Black Elastic Silicone Eyeglasses Strap Anti-slip Glasses Strap Soft Eyewear Retainer Sport Unisex Sunglass Retainer Holder Straps