Every snow goggle Spy Optics designs pair a unique style and personality with uncompromised fit, clarity, and technology so even the snowiest conditions won't stop a clean run. The free bonus lens and Quick Draw lens change system put the midsized Ace at the top of the deck. In volatile conditions, you can easily slide the bonus high-visibility lens into place and quickly return to the action-without losing time to mother nature's wicked ways. Spy Optics patented Happy Lens Tech enhances color and contrast and is scientifically tuned to boost mood and alertness, providing a visual experience unlike anything else. Anti-fog injected SIC (Superior Injected Curve) dual lens maintains lens shape for optical clarity. Quick Draw lens change system allows you to change lenses on the fly. Comes with a free premium bonus lens so you're covered in any light conditions. Anti-scratch coating provides enhanced impact protection. 100% UV protection shields your eyes against damaging high-altitude sunlight. Custom built from flexible, durable polyurethane and polycarbonate for seasons of use. Scoop ventilation system increases air flow and decreases fog-causing sweat and moisture. Triple-layer Isotron face foam with moisture-wicking Dri-Force fleece provides comfort while drawing fog-causing sweat off your face. Compatible with the most popular helmets on the planet. Silicone-lined strap prevents the goggle from slipping on your helmet or headwear. Goggles measure (W x H) lens 5. 9" x 3. 5" (150mm x 89mm) and frame 6. 7" x 3. 74" (170mm x 95mm).