JM Adjustable eyewear retainer fit most glasses, perfect for those with glasses playing sports or doing exercise. It's also perfect for the beach, water/amusement parks or anywhere you might lose the glasses. When you have one pair of JM Eyewear Retainer: Do not worry about losing your expensive glasses You can go anywhere with this glasses protective rope Release your glasses and hang it over your neck to rest your eyes Keeps your glasses from falling off your nose when sweating and looking down Adjustable for a tight fit or for a loose off-the-neck fit