The Oakley SI Ballistic Halo Goggles are part of the Oakley Alpha ecosystem, a modular and scalable platform that strives to meet the demands of those who face the unknown. For a soldier going to the field, versatility is key. The Oakley Alpha system utilizes a single lens that can be used across all platforms to provide the precise level of protection called for by each mission. The SI Ballistic Halo Goggle lenses can be easily swapped out to the Oakley SI M-Frame Alpha frames, and multiple lenses are available to provide enhanced sight for any situation.