Alpine touring boots are designed for use with alpine skis, which have a narrower waist width than touring skis. These boots usually have a more rigid sole and cuff, which offers better downhill performance but can make walking and climbing more difficult. Some alpine touring boots come with an interchangeable sole system that allows you to swap out the alpine sole for a walking sole, which can make them more versatile. Whether or not you can use your alpine boots for touring depends on the type of boot and ski you have. It's always best to consult with a professional before attempting to use your equipment for something it wasn't designed for.