NewWomen’s 6Men’s 5We designed the Relay Trainer for an accommodating yet supportive fit. We recommend choosing your regular size for this model.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.The Relay Trainer features a supportive fit with a breathable, non-stretch mesh upper and fits true to size.We recommend going with your usual size.Bonus: our shoes are unisex, with men’s and women’s styles offering the same fit. This means sizes can be converted to suit a wider range of people. Men’s sizes are 1 full US size smaller than women’s. For example, if you are a women’s US 10, you can also purchase a men’s US 9 for a perfect fit.