The Von Zipper ALT SM Goggles and their XM twin keep things calm, cool and collected. The SM alludes to their smaller lens shape, perfect for smaller faces and riders who'd rather stay away from the bug-face huge lens style. The dual polycarbonate lens keeps things in perspective with Uber Maximum Peripheral Vision and Glaricade Super Anti-Fog and Hard coating to prevent wear. Throw in the extra cozy three layered face foam and forward venting for air flow, and you'll understand why these gogs are the perfect way to keep the good vibes flowing.