Serengeti Velocity Sunglasses with upgraded soft silicone gel nose pads for a more comfortable fit and better nose grip.Professional Pilots who wear sunglasses most of the day prefer this modification. Velocity’s light-weight titanium frame is built for speed, yet balances like a feather on the bridge of your nose. All Serengeti lenses offer the latest in photochromic technology, which constantly lightens and darkens throughout the day to ensure you see every detail. Most Popular Aviator Sunglasses. Replacement lenses.