Auralex UBFF U-Boats are among the industry's most affordable solutions for floating floor installations. Made of a specially-formulated rubber U-shaped channel, U-Boats are used to support framing members and isolate them from the surrounding structure. With the help of U-Boats, a floated room features improved transmission loss (isolation) and low frequency definition. It's easy to figure how many U-Boats to underlay: just multiply the total square footage of the area you want to float by two thirds; the resulting number gives you the approximate amount of U-Boats you'll need. U-Boats are the industry's most affordable floating solution and are much easier to use than those exorbitant "pucks" that have been used in the past