The present application relates generally to tubes, such as thin walled catheter liners with small wall thicknesses (e.g., less than 1 mm), including crosslinked fluoropolymers, e.g., crosslinked poly(tetrafluoroethylene). The disclosure further provides methods of manufacturing such tubes and systems for manufacturing such tubes.

A heat shrink tubing is provided exhibiting various desirable properties, which generally comprises at least one fluorinated polymeric resin. The tubing can exhibit desirable physical properties such as heat shrink capability, high expansion/recovery ratio, low longitudinal shrinkage, low temperature recovery, and an average wall thickness of less than about 0.003 inches.