Bright and sunny conditions require a dimming lens tone.
The Cylindrical Lens is a flat lens with a single lateral curve that provides a superior field of vision. It also looks great!
UV400 & Anti Fog refers to the intense UV protective qualities of HEAD lenses and their ability to minimise fogging. The light on the mountain is intense so you need the best protection possible as well as anti-fogging qualities to maintain the best visibility.
Brown lenses are the most versatile lenses for ervery condition.