AirEvac™ ventilation system integrates with Smith goggles for fog-free lenses

True Sintered is harder and more expensive than extruded and it can be faster for those that ride aggressively fast

comfort and fit

Youth Single Strap:

Smith Defy Sunglasses po1misskju AirEvac™ ventilation system integrates withWhether you're running, rolling or sliding, a crisp view of the terrain translates to full speed ahead fun. The Smith Defy sunglasses double down with a lightweight, rimless design and terrain defining ChromaPop optics for unobstructed, high contrast vision. Whether you're on the move in the hills or simply taking in the view from the back deck, an interchangeable lens lets you match the light conditions. Product Details Vision ChromaPop lenses