Another Way To Beat The Heat If You Don’t Mind Looking Like A Dork. 

Puffy clothes with built-in fans are getting popular. A former Sony engineer came up with the idea and started selling “fan jackets” in 2004. Early versions chewed through batteries, but now they can go all day. The power-tool company Mikita started selling their own version for construction workers in 2015, and say sales have been way up the last few years. There are also a million knock-offs on Amazon now that cost anywhere from $40 to $300.