Spy Optics was born out of a need for new types of sunglasses for action sports that had grown in popularity. Pushing eyewear into new realms, their sunglasses, including the Spy Dirty Mo Sunglasses, combine comfort and fit with the ultimate technology. The Spy Dirty Mo Sunglasses come with the following features: Spy logo on temples. Made of propionate, which is a lightweight and hypoallergenic material. Polarized lenses (depending on frames), which block intense reflected light and reduce glare. Dale Earnhardt Jr.'s signature frames. 100% UV protection.