The Smith Syncline ChromaPop Sunglasses build helmet compatibility directly into the frame. An integrated bumper along the temple keeps the fit chatter-free where the frame meets a helmet, and the 5-base cylindrical curvature wraps enough to block trail debris and wind without the bulk of goggles. Evolve bio-based frame material keeps that larger coverage light through a full ride. What Our Gearhead(R) Experts Are Saying:"I climb hard enough to sweat through my helmet pads, and the lens gap in these vents lets that moisture out before it ever fogs my view. That's the difference between glancing down to wipe a lens and staying locked onto the trail in front of me."