Adding an Asym collar to the new version of New Balance 20v5 cross training shoes creates a better, more natural fit for your heel. These low-profile shoes are incredibly light and flexible, allowing you to move with more agility, freedom, and dynamic energy. You'll feel secure and empowered. So comfortable you can wear them with or without socks.Upper: Asym collar with molded foam allows for a more natural heel fit. Burrito Tongue provides a better, locked-in fit and keeps the tongue in place. Synthetic overlays offer lightweight support. Mesh provides breathable flexibility. Lace-up front offers an adjustable fit.Midsole: REVLITE compound provides the same responsiveness and durability of foams 30% heavier with a lightweight ride that doesn't minimize construction or sacrifice underfoot cushioning or stability. Outsole: Vibram® outsole provides maximum surface contact and multi-directional traction.