SPY+ revolutionary therapeutic Happy™ lens tech is scientifically tuned to boost mood and alertness while enhancing color and contrast, providing a truly life-changing visual experience. ARC (Accurate Radius Curvature) polycarbonate lenses are tapered to follow the natural curvature of the eye, providing crystal-clear distortion-free vision while reducing eyestrain. Available with polarization, which blocks over 99% of surface glare and is layered and sealed within SPY lenses to prevent scratching, delaminating, and hazing of your polarized filter. Constructed from Grilamid, a lightweight frame material ideal for everyday wear due to its strength and flexibility. Robust 5-barrel hinges for added durability. 100% UV protection reduces eye fatigue and long-term sun damage. Replacement lenses available. Frame measures: 57-17-145mm.