The fluorinated ionomer Nafion is a material that provides efficient proton conducting membranes for application in important technological areas such as hydrogen fuel cells. Despite being carefully studied for the 20 years or so since it was first discovered by the DuPont company, the microscopic mechanisms for proton transport in this polymer are still only poorly understood. We have made an exploratory muon study of Nafion that has demonstrated that the muon probe is highly sensitive to the hydration state of the polymer and to the dynamical processes of the various subphases within the material. A three component model is found to describe the data well, with an F-mu-F component reflecting muons in the polymer matrix and further components reflecting quasistatic and highly dynamic proton-coupled environments. This proposal aims to continue on from these promising first results