Based on these key values, quantitative analysis of shape recovery was conducted. For this purpose, the DMA instrument was used to expose a tensile test specimen to programmed cycles of (i) heating to 140 °C (ii) stretching to 50% strain, (iii) cooling to room temperature, (iv) releasing the applied force and (v) reheating to 140 °C without applying external stress (Figure A, Supplementary Figure ). From (iv) the occurring contraction of the specimen allows the calculation of the shape fixity ratio , which is the percentage of shape deformation that persists after shape imprinting. (v) is used to calculate the percentage of recovery of the remaining strain. For all cycles except the first, excellent shape recoveries above 96% were achieved. Even more impressively, shape recovery continuously improved and reached numbers above 98% during the final cycles due to the training phenomenon. Throughout all measurements, near-complete shape fixity was achieved (99%) with an average shape recovery of around 97%.