Reverse stable deformation by elastic recovery at elevated temperatures. The ductile glassy networks are capable of maintaining large deformation while inheriting the ability of elastic recovery. We noticed that the strained meta-phthalamide polymer specimens remained strained for weeks without any noticeable shape recovery, similar to plastic deformations found in thermoplastic polymers. When we applied gentle heat (close to or above Tg), the specimen promptly contracted to its original shape (Figure ). The recovered specimen could be deformed again, showing nearly identical strength and toughness, after five cycles for the meta-phthalamide/EBMP-TEMPIC (f=2.125) system (Figure ). Note that the tensile test was stopped at 200% strain to prevent breaking. We reason that the recovery is elastic since the original shape and properties are preserved. Interestingly, the large deformation is stable for a long time while the polymer chains are compelled to stay in the strained state.