Wiley X SPEAR meets the strictest requirements ballistic. Symmetrical ventilation system Top Down and dual lens (only DUAL version) glasses kept fogging free. Its 2.5mm lens provides 100% protection against UVA and UVB rays, clear undistorted. Supports prescription lenses with inserts accessory RX (sold separately). Low profile design compatible with night vision system (NVG) .Caracteristicas: MARCO · size mount 45/18/120 mm (diameter lens / wide bridge / long pin) · head size: ML · Goggle tactico low profile multifunctional. · Compatible with night vision systems (NVG). · ventilation System Top Down prevents fogging. · surround frame with 90 degree angle, eliminating tunnel vision. · Protects eyes from wind, sun, glare and fragmentation .