Dolgan Alti Spectron X6
I bought these glassless for backcountry skiing trips. I chose these over the X4 as these are darker and have glass lenses. The X4 is similar to a dark sunglass you might get for biking, whereas the X6 is too dark for driving and just right for a bright day on snow. The side shields work great, having a sliding position to allow better air flow. I sweat a lot and never had a problem with fogging. Fit is hard to describe, but I'd say they fit a normal to big head. I wear Trifosi on a day to day basis, so the fit is comparable. Great quality, great price.