Most goggles are either non-mirrored, mirrored or polarized. Non-mirrored lenses are best for indoor swimming, since a tinted lens while inside might make it too dark to see. Mirrored and polarized lenses are best for outdoor swimming because they reflect and filter out the sunlight.If swimming outdoors, it's important to wear a swim cap to protect your head from the sun, too.

Some goggles will have hydrodynamic lenses, which allow you to have a wider peripheral view. This isn’t necessary if you are planning to just swim laps, but for training and competitions, it increases your visibility while underwater (so you don’t swim into a lane line during your race). If you need goggles for swimming laps or for swim practice, you’ll want something that is comfortable and fits your face well. For competitions, you may want to pay more attention to the other features (such as visibility or sunlight protection), and whether they are anti-fog or leakproof, rather than comfort. Brown Polarized lenses decrease light transmission to the eyes and filter bright light reflections seen on the water surface, reducing glare and discomfort to the eyes. Makes objects appear clearer and sharper, increasing visual clarity and comfort. Ideal for outdoor swimming in bright light conditions or when the sun is low on the horizon. Aquasphere Kayenne Polarized Lens Swimming Goggles, these FINA approved goggles from Aquasphere, have proven to be the swimming goggles of choice for many swimmers and is a particular favourite for triathlon having been previously voted "Best on Test" by 220 Triathlon.Aqua Sphere Kayenne Goggles are potentially the most superior performance swim goggle available and have become one of our most popular must have goggles amongst the triathlon/biathlon crowd. The Kayenne goggles from Aquasphere with its unique, oversized lens design, combines expanded 4-point vision with superior hydrodynamics thanks to its low-profile micro-frame. Featuring Aquasphere's Curved Lens Technology offering the clearest visibility through superior optics and engineering, virtually eliminating distortion and delivering uninterrupted 180deg field of vision and exceptional hydrodynamics.