The new 20" woom OFF 4 provides off-road capability in a lightweight package with ergonomics that are designed specifically for children. NOTE: You won't be able to upgrade the woom OFF to an air suspension fork later on. If you think your rider would benefit from suspension, consider the OFF AIR. Better OFF Take your young Rider beyond the beginning stages of their mountain biking journey with the new 20” woom OFF 4! Stable, responsive, and equipped with high-performance components and tubeless-compatible rims and tires, it provides best-in-class value in its category. The woom OFF 4 is happiest venturing down a gravel path, up a dirt mountain road, or on the MTB trail, but will hold its own on any urban playground or paved path. Off-road capable, kid-tested, and ergonomically designed for growing bodies!

Description from ATX Bikes.