The PM series is Outside Edge's top of the line in performance and durability, and were designed with the serious sportsman in mind. This series features fully phase coated BAK4 prisms and full broad band coated optical lenses for amazing brightness and clarity. Being sealed and nitrogen purged, this series is waterproof and fog proof, and having a rubber coated chassis makes it resistant to shock. The PM series comes standard with lock-in / lock-out twist up eye cups for eyeglass wearers and comes with lens covers, a deluxe padded neck strap and nylon carrying case.