Summer heatstroke cooling and cooling artifact PCM cold circle suction heat and cold sensation neck sports cooling hanging neck ice pack ice -neck

Product difference (use duration is related to ambient temperature): generation : adventitia pvc + Gel (use after freezing in the refrigerator, length of use 40 If the film is thin, it will feel too icy when used, and it will look like ice cubes) Second generation: adventitia tpu Double over + Smoothie liquid (use after freezing in the refrigerator, duration 40 Divide into about 100 pieces, the film is thick enough to prevent leakage and form into a smoothie shape) Third generation: outer membrane tpu Double over + Phase change stock solution (less than 18 or 28 It can freeze at temperatures below 40-60 minutes, into cotton wool shape, constant temperature 18 Degree or 28 degree, body feeling comfortable) Fourth generation: upgraded anti-penetration tpu membrane, adventitia tpu Double over + Phase -changing raw solution + The water injection port is capped (lower than 18 or 28 It can freeze at temperatures below 40-60 minutes, into cotton wool shape, constant temperature 18 Degree or 28 degree, body feeling comfortable) One generation of ice packs: PVC (water+ice crystal), refrigerated after refrigerating the refrigerator Product weight: 158g-185g (naked weight) Product size: 13*11…