No sky’s the limit. Trail running athletes today are pushing the boundaries of what’s possible. Runs that used to happen below the treeline are getting pushed further up the mountain. People are going farther than ever before, longer than ever before, and the mountains don’t relent. They can change on a dime. Designed for and tested by our best trail athletes, the MTL Long Sky is made with everything runners need (and nothing they don’t) to adapt on their longest runs in the most rugged environments.