Our eyewear strap is made from neoprene, when in use is positioned securely at the back of your head for added security when wearing your glasses during sporting activities, theme parks & more. Perfect For Use in Sporting Activities, Adult length - 16 Inches Long, Simply Twist Your Eyewear Temples Up Into The Strap Until Secure. We have over 12 years in specialising in eyewear accessories, these are designed with our knowledge & experience regarding sizing & quality. Black Adult Mens/Womens Neoprene Sports Glasses Sunglasses Strap Cord Holder