Meet the most versatile running shoe: the Relay Trainer. It's designed for everything from short runs, long runs, easy runs, hard runs, jogs, walks, and your favorite gym workouts - it's ready to do it all.What's the secret? We've created a cushioned yet stable midsole that combines a firmer outer rim made of Sugarcane-based foam with a softer Algae-based foam center to give you the best of both worlds. Cushion for when you're going the distance and stability for when you're making moves in the gym.