Skullerz Loki Safety Glasses are designed to be worn as regular sunglasses or as safety goggles by removing the temples & attaching the elastic strap & removable foam gasket for a dust-beating seal (both included). Tough, scratch-resistant lens filters 99.9 percent of harmful UVA, UVB & UVC rays to keep your eyes safe in the sun. Protective, work safety sunglasses are military tested & ANSI Compliant. Ideal for indoors, outdoors, low light & hazy / cloudy conditions, this yellow lens increases brightness in dull conditions. Durable, nylon frames bend & flex without breaking. Nonslip, rubber nose piece & rubber temples keep the glasses secure & resist sweat. Frame width is 144mm.