Sneaker Shields come in 2 distinct varieties. The Universal is a softer, more flexible wearable shoe tree that is perfect for use every day with any type of casual sneaker or even a dress shoe like wing tips or loafers.The Protector is a little more firm and designed with Air Force Ones in mind. A firmer wearable shoe tree allows you maximum protection for your most valued custom air forces or limited release sneakers. Whether you choose the Universal or the Protector model, you will have the perfect sneaker accessory to finish off your shoe care kit.