The Wiley X Spear goggles are made for any tactical operation. These goggles feature a low-profile design packed with powerful features, including a Top Down ventilation system to resist fogging, NVG compatibility and lenses that meet ballistic MIL-V-43511C standards. Swivel hinges allow these goggles to be adaptable for use with a helmet or without. The frame and straps are heat-resistant and the strap material incorporates a Tri-Glide system to adjust to an ideal length and fit. A 90-degree wrap-back on the frame eliminates tunnel vision and the 2.5mm lenses keep your eyes safe with 100% UV protection, making these goggles ready to tackle any challenge. Eye Size (SP29X Rx Insert): 45 & DBL: 18 & Temple: 120 Head Size: Medium to XXLarge