The Smith Knowledge OTG Snow Goggles with RC36 Lens provide exceptional fog prevention, comfort, and fit for eyeglass wearers. Its large interior volume that accommodates a wide range of eyeglass sizes and combined with Smith's proprietary 5X™ anti-fog inner lens, gives you the comfort and fit you want with the performance you need. The Knowledge provides incredible anti-fog performance for eyeglass wearers. The Knowledge goggles are equipped with RC36 (36% VLT) Lenses which are a S2 Category universal lens tint that combines rose and copper base tints and improve the depth perception and contrast as well as it cuts glare in all conditions, providing 100% protection from the harmful UVA/B/C rays. The Smith Knowledge OTG Snow Goggles with RC36 Lens will let you enjoy your winter adventures to the fullest!