The Bolt Goggles are designed with silicone eye gaskets to provide a watertight seal - Creating the most comfortable competitive goggle. Designed to be worn in both practice and competition, the adjustable split-strap distributes pressure evenly around the head. The Bolt goggles come with three interchangeable nose pieces and an adjustable strap for a universal fit. Why the BOLT Goggles are our go-to: LOW PROFILE LENSES: Designed for competition and fused with the frame to reduce drag and increase speed in every swim SILICONE EYE GASKET: Provides added comfort and a watertight seal to make every lap distraction free DUAL SILICONE STRAP: Distributes pressure evenly around the head to increase comfort and decreases distractions during practice or competition THREE NOSE PIECES FOR CUSTOM FIT: Interchangeable nose pieces will allow any swimmer to get their preferred comfortable fit ANTI-FOG, UV PROTECTION POLYCARBONATE LENSES: Ensure your eyes can see through the goggles at any time and protect your eyes from harmful sun rays MIRRORED LENS: The eyes are the window to the soul so many swimmers like the psychological advantage mirrored lenses give them in competitions, but the main purpose of this lens is to reflect light away from the eyes and provide a darker view. Mirrored lenses are good for bright days and for open water swimming. Suits: Racing, Fitness, Open Water Swimming and TriathlonSunny conditions. Open water. Bright, indoor pools.