Proven fit and performance make the all new Project one of our best-selling goggles. Built around Airflow lens technology pioneered at Smith, the active ventilation helps to reduce fog even in the worst conditions, making the Project a go-to choice for a fun day on the hill. Cylindrical LensCylindrical lenses are built on a base curve in only the X (horizontal) axis. Smith's cylindrical lenses are offered in carbonic-x material with and without TLT optics and a base 6 curve. It provides Class 1 optical standards and optimum fit characteristics. Fog-X Lens TreatmentSmith s Fog-X lens treatment employs a hydrophilic, micro-etched surface to absorb moisture and disperse it over a wide surface area to prevent fogging. Because it is physically carved into the lens, it can't be wiped away like other anti-fog coatings.