Inov-8's new graphene trail running shoe literally nitro-boosts feet

True to its name, British running footwear company Inov-8 has never shied away from new materials or features. For a few years now, it's been focusing in on graphene for its trail running shoes. Now it's mixing a little nitrogen into the formula. More specifically, it adds a nitrogen-injected foam it calls "Flyspeed" to enhance the new Trailfly Ultra G 280 with a light, soft ride and a response that's reportedly so reactive it almost feels like cheating. And who couldn't use a little extra zip in their stride on the last few miles of a high-alpine ultra?