The ESS Crossbow Photochromic Eyeshield is created using Transition Optics Lenses and have redefined performance and utility for eye protection. Its ClearZone FlowCoat technology minimizes scratches. The Tri-Tech Fit ergonomics offer universal comfort and stability with zero pressure points. Clear ESSOPTICSTM exceed rigorous standards, offering a true view of your objective. And the Crossbows patented DedBolt Lens Lock pivots open for quick lens exchange or locks shut for rock-solid retention under impact.