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Not even close. Ultralights (and their cousins the hang-glider and paraglider) are smaller, lightweight, typically open-structured aircraft designed for easy portability and storage. Gliders are a category of airplane certified by the FAA, and have features more commonly associated with aircraft (enclosed cockpits and the use of control surfaces on wings and tail). The aeronautical performance of gliders well exceeds that of even the best ultralight.