Polarised sunglasses for every occasion. Apart from the additional benefits of polarisation reducing the glare off the water so that we can spot fish more easily or simply see where we are are putting our feet when wading; the medical benefits are far more important, reducing harmful UV rays which is the most common cause to partial sight loss. 

If you spend lots of time outdoors both on the rivers, in the mountains or sailing quality polarised glasses are an essential piece of kit.