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Figure 4. Application of crossed stretchable zipper in smart wearable systems. (A) Personalized implementation-based wearable system for hemiplegia rehabilitation; (B) A bodysuit equipped with cross zipper; (C) Strain distribution of bodysuits equipped with zipper-free, stretchable and crossed nonstretchable zippers during static respiration; (D) Strain diagram of the bodysuit in five key areas covered by the zipper; Changes in (E) breaking force and (F) anti-separation force under different strain conditions after the cross adapter undergoes loading-unloading cycles simulating static respiration. ECG: Electrocardiogram; EMG: electromyography; PCB: printed circuit board.