The Dynafit Revo Sunglasses in Winter Moss are a full frame Category 4 glacier glass for high altitude and snow, with removable side shields and a brow pad. Category 4 is the darkest lens class there is, made for the light levels found on glaciers and high snowfields.

• Category 4 lens: the darkest lens category available, intended for glacier travel and high altitude rather than everyday use.
• Not legal for driving: Category 4 lenses may not be used for driving in the EU, which is worth knowing before buying.
• Removable side shields and brow pad: the shields block reflected light from the side and come off when they are not needed.
• Full 360 degree frame: the wraparound frame gives a wide field of view and keeps wind and spindrift out of the eyes.
• Frame ventilation: vents in the frame reduce fogging during effort.
• Grippy contact points: rubber temple tips and a silicone nose pad keep the glasses put when you sweat.
• 41 g: polycarbonate lenses with 100 percent UV protection, made in Italy.