OverviewWindsor packs light but hits heavy with its unmistakable shape and keyhole bridge. A lightweight Z-Resin frame with ProFlex Rubber on the nose and temple tips give Windsor the adventure ready pedigree Zeal Optics is known for. Explore in style with Windsor. Ellume Polarized lenses eliminate glare and block 100% of harmful UV rays, protecting against the risk of long-term damage to your eyes. Zeal Optics frames and Ellume Polarized lenses are made from Z-Resin, a unique plant-based polymer derived from the castor plant. This durable plant-based material contributes to lighter frames and creates a high-purity lens for cleaner, crisper vision.