EAGLE OPTICAL SWIM GOGGLES Colors:Clear Transparent The Zip VX leverages the Equipment & AccessoriesTraining Gear The Zip VX leverages the energy created by the fins movement through the water to produce a springboard effect that boosts swimming efficiency reduce drag and maintain streamlined body position Utilizing a unique construction of a one piece silicone skirt and nose bridge frame combined with interchangeable lens retainer allows swimmers to purchase right and left high grade optical lenses to meet their specific vision Eagle swim goggles come with polycarbonate interchangeable diopter lenses (half step increments from 1