Speedo's Biofuse goggles combine a super strong core structure with a molded outer shell that suctions snugly around your eyes for an airtight fit. Construction begins with Speedo's anti-fog lenses, which are set into a rigid frame that is actually molded around them, virtually eliminating any chance that the lenses will flex and distort a swimmer's vision. The inner frames are then coated in an extremely flexible sealing material that offers superior cushioning, and just the right amount of give to mold themselves to a swimmer's individual eye shape. These swim goggles are a great choice for recreational swimming, and are offered in three different lens shades to control glare under most conditions.