Article One’s all-purpose athletic frame, the Bird, has an angular, classic silhouette – like its namesake. Incredibly durable and lightweight. Made to hold shape in the highest temperatures and the toughest workouts, the Bird's wire core skeleton allows you to squeeze the frame tighter during a workout and loosen afterward. Its silicone nose pads are made to grip and hold plus silicone pads wrap around the ear for additional comfort and grip. Spring hinges give, then bounce back, during rough wear.