Sony REON POCKET 4

Japan in the summer is not for the faint of heart. Temperatures soar well above 35 degrees Celsius and the humidity often pushes the air into an almost unbearable wall of heat. Commuters crowd into trains, students cycle to school under the blazing sun, and tourists line up at shrines while drenched in sweat. This is the reality that makes the Sony REON POCKET 4 feel less like a luxury gadget and more like a necessity.

The REON POCKET series began as an experimental project, but it has now matured into a fourth generation wearable cooler and heater that reflects Japanese precision and problem solving. The REON POCKET 4 is a small device worn on the back of the neck with a specially designed shirt that keeps it secure. It cools or warms the body directly using a Peltier element and sophisticated temperature control software. Unlike fans or handheld devices, this product targets your core thermal comfort and reduces the body’s sense of heat stress.

Convenience is at the heart of why this device stands out. It connects with a smartphone app through Bluetooth, allowing automatic adjustments based on your environment. Walking outside under direct sun triggers stronger cooling, while entering an air conditioned café dials it down without you having to touch a thing. Battery life has been extended compared to earlier versions, lasting up to around 7.5 hours of continuous use with the optional external battery accessory. For commuters spending long hours away from home, this makes the device reliable rather than gimmicky.

The design is discreet and minimal. Tucked under a shirt collar, it is nearly invisible to others, unlike wearable fans that make noise and draw attention. This means you can wear it to business meetings, on the train, or at cultural sites without looking out of place. For many in Japan, blending in and maintaining a professional appearance is just as important as staying comfortable. The REON POCKET 4 achieves both.

Equally important is the fact that this is a product born and made entirely in Japan. It is tailored to the country’s unique climate challenges, and it reflects Sony’s tradition of innovation aimed at everyday life. Unlike global gadgets mass produced for multiple markets, the REON POCKET line is sold primarily within Japan, making it a kind of local secret. Owning one is not just about beating the heat but also about experiencing Japanese ingenuity at its finest.

As summers continue to intensify due to climate shifts, solutions like the REON POCKET 4 show how technology can directly improve quality of life. For anyone spending time in Japan between June and September, it is less of a gadget and more of a survival tool. The REON POCKET 4 proves once again that when it comes to combining practicality with subtle design, Japan leads the way.