Barz swim goggles for lap swimmers and triathletes feature a relatively wide field of vision. The frames have three sizes of interchangeable, flexible nosebridges for proper fit. Frames have high-quality silicone strap and gaskets.The goggles have shatterproof polycarbonate lenses with built-in, off-the-shelf correction in increments of .50. The lenses are tinted for outdoor swimming, provide 100% UV protection, and have an anti-fog coating on the inside.To order Barz prescription swim goggles, choose a Swim Goggle frame color, then choose two (one left, one right) corrective lenses. Even though we refer to them as left and right, corrective swim lenses are interchangeable and do not need to be the same power. Lenses are packaged separately from the frame and are easy to pop into frames.