Magpul’s Terrain model is for those who require ballistic impact protection. It features ballistic Rated Z87+ and MIL-PRF 32432 lenses and frames meet both high velocity impact protection and safety ratings.
The Explorer model is more for casual wear. Though not rated to Z87.1 due to the wrap and shape of the Explorer, the lens and frames were engineered to the Z87.1 ballistic impact protection standards
Either way, they offer great styling. Check out the lens and frame colors at www.magpul.com/apparel-gear/accessories/eyewear.