As a minimalist gifted swimmers for years I used only the hard plastic Goggles. Disadvantages here were fogging, for hours fummeliges setting etc. I have taken it inkauf because I always had problems with the fit of the other spectacles. Randomly I've ordered for the last vacation this spectacle and am asked fully satisfied: Very good fit despite fixed nosepiece, very good optical properties (barely discernible distortion), beautiful tone, barely up no fogging, excellent and rapid adjustment of the band length, nice storage box (actually sales package). The only drawback: scratch-sensitive optical plastic. Despite careful handling scratches are fast times came on the lens. This can be avoided in the sand hardly, the glass becomes cloudy in the long run but sicherlichein. For the swimming pool use irrelevant, for the open water swimmers may badly wg. Against light reflections and the recognition of more distant objects that you would like to use as a guide. Nevertheless, strong buy recommendation!
