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. Active Google: Great goggles for recreational swimmers. • BioFuse Technology for superior fit. • Double silicone headstrap. • Anti-fog UV protection. • Latex free. Speedo BioFuse products are engineered to perform in harmony with the human body through the bonding of structure and flexibility. Hard skeletal properties provide strength and shape while flexible materials offer comfort and optimal fit. Speedo BioFuse goggles are intricately produced in 3 stages: 1. Anti-fog solution is inset into lens. 2. The frame is molded around the lenses creating a lasting bond. The addition of the frame makes the unit more rigid, eliminating lens flexing which can distort a swimmer's vision. 3. The soft seal material is molded over the frame. Because the frame is so rigid, the seal can be softer than on most traditional unibody goggles, giving swimmers a more comfortable fit.