Whether we are on the road or the water we depend on our Tonics as the polarised lenses  cut the glare giving us the clearest vision possible.  The glasses are so lightweight they can be worn all day long.  Wearing the photochromic lens enables us to wear the glasses all day long in varining light which is important driving on those tracks and when site fishing.  

Talk about durability check this out https://www.youtube.com/watch?v=Rvgr0ZwndrI&list=PLkMRv2yAPS8WBllNRAsTYpikJucJRCxjQ  This is one of many reason we love our Tonic Sunglasses.