This pair of prescription goggles is made of strong and durable plastic, which can cope with long term wear. The inside prescription frame of this pair of prescription goggle boasts the lens width at 40mm, lens height at 27mm and bridge at 20mm. Total outside width is about 155mm. It is just perfect for single vision correction needs. The outside wind shade is replaceable. Four pieces of extra shades in different colors are for the replacement. There are three oval holes on each temple, helping the skin breathe freely to provide super comfort wear. Frames in black, silver and blue are available.