A polytetrafluoroethylene (PTFE)-reinforced Nafion composite material is a cost effective alternative to a pure perfluorosulfonic acid (PFSA) membrane, which is often applied as membrane in proton exchange membrane fuel cell (PEMFC), simply by lowering the amount of expensive PFSA applied for the membrane production. The reduction in cost is an attractive factor, but it is still a challenge to produce the composite membranes as efficient as commercial membranes. Recent research and application activities with the reinforced composite membrane for PEMFC applications include impregnation of the PFSA ionomer into the PTFE support, improving proton conductivity, reducing gas permeability, and addition of radical scavengers. In this talk, our recent results from these activities will be presented.