The smallest profile, the lightest and the best field of view on the market. The i4 is the culmination of Dye's years of experience in mask development. The thermal lens is the industry leader in optical clarity and offers a distortion- and fog-free field of view in all weather conditions. The i4 system features a variety of lenses that can be adjusted to suit your lighting conditions. FEATURE QUICK VIEW Anti-fog thermal lens Rapid Lens Change Horizon Peripheral Vision Scream Venting Anatomical Fit & Function Tiger Teeth Strap Retention Compression-Formed Ears