Fabrics can be heat slit and sealed into tube configurations with a double heat seam. Double heat seamed tubes are produced by simultaneously heat slitting two layers of fabric with a heated blade. This process creates two flat seams. While double heat seamed tubes are most economical, they are not recommended for applications requiring strong seams.

Fabrics can be ultrasonically welded into tube configurations with a double ultrasonic weld. Double ultrasonic seamed tubes are produced by joining two pieces of material and then ultrasonically welding each edge together, creating two flat seams. Ultrasonic tubes can be produced in very small diameters, with accurate strong seams.

Fabrics can be ultrasonically welded into tube configurations with a single ultrasonic weld. Single seamed tubes are produced using one single layer of fabric which is overlapped and then ultrasoincally welded. This widely used product is custom-fabricated with smooth edges and hold very tight tolerances. Ultrasonically welded single seamed tubes have a higher shear strength than a double seamed tube.