A thin, biocompatible, high-strength, composite material is disclosed that issuitable foruse in various implanted configurations. The composite material maintainsflexibility in high-cycleflexural applications, making it particularly applicable to high-flex implantssuch as heartpacing lead or heart valve leaflet. The composite material incudes at leastone porousexpanded fluoropolymer layer and an elastomeric material substantially fillingsubstantially all ofthe pores of the porous expanded fluoropolymer.
