Galfer Disc Brake Adapter +20mm Inflatable Compatibility extends to industry standard 10 speed Compatibility extends to industry standard 10 speed systems Junior LastBoot shell addresses common problem fit areas for a comfortable fitFocus on ComfortComfort fit liners feature soft materials for all day cushioning and warmthDurable Aluminum Buckles100% Aluminum buckles provide long wearing durability and ease of operationGripWalk® Compatible (Sold Separately)GripWalk® soles feature a rubber tread and rockered toe for a more natural walking motion and increased traction Galfer Post Mount adapters allow the use of larger rotors than standard size Adapter allows the ability to run a bicycle rotor up to 20mm larger than standard size