CNN  —  As summer temperatures in Osaka, Japan, soar closer to 100 degrees Fahrenheit, staff at Expo 2025 are beating the heat with utility vests that are powered by the sun. Developed by Toyota Group company Toyoda Gosei, in collaboration with solar cell startup Enecoat Technologies and textile manufacturer Seiren, the utility vests are fitted with ultra-thin, flexible solar panels that weigh less than four grams each — lighter than a single sheet of paper — and power neck fans to keep the