Cablz Original Style Cable Eyewear Retention System Made with surgical grade stainless steel cable coated in black or clear Does not soak up sweat, get dirty, stink or fray and keeps your eyewear secure Cablz Regular rubber ends fit glasses with earpieces between 3-9mm in width. 80% of the sunglasses on the market today have frames in that range Cablz XL rubber ends fit glasses with earpieces between 9-17mm and XS fit 3mm or less Ideal for fishing, biking, hiking, rock climbing, snow skiing, snowmobiling or just enjoying the great outdoors