Eforstore 6 Pack Sports Sunglass Eyeglasses Silicone Safety Holder Eyewear Retainer Strap Random Colors for shipping Made of Silicone ,Skidproof Size: 22*6*1.2 cm It can stretch to 60cm/24inch,fit for almost people Adjusting the distance between the holder and glass legs to fit for your head size Perfact for people who love sports