Worried about what size to order? Use this free app (click here for iOS and here for Google devices) to instantly find your size. And if the fit isn't perfect, we'll be happy to exchange it.

4th of July Sale! 20% off (as marked), plus get a FREE Halo ring with your purchase with code JULY4HALO. (Just add the Halo you'd like to your cart and apply the code at checkout.)

• Made with high-performance carbon fiber and our custom glow material
• Hours of glow time with each charge
• Easily charged with sunlight or a UV flashlight (included for free)
• Ultra-durable and unconditionally guaranteed
• Handcrafted in Brooklyn, New York

Designed to conform to the Golden Ratio, the F1 offers a perfectly balanced look and feel in a clean, modern aesthetic. Filament wound carbon fiber creates a high-performance, lightweight exterior with a clean, lightly etched look. Inside, a luminescent interior gives off a radiant glow when charged with a UV light or sunlight. Each ring is handmade in our small shop using only the finest materials available and features our signature comfort fit interior, a more pronounced comfort fit that makes our rings both more comfortable to wear and less likely to ever get stuck on the hand. 

Unconditionally Guaranteed: If your ring doesn't fit perfectly, we'll be happy to exchange it for the right size. And if any of our products don't meet your expectations in any way, we'll happily replace them or send you a full refund, whichever you prefer.