Geek Out Store Heat Reactive Bandanna Condition: New, Unused (Unopened) This bandana reacts to heat around 30°C (86°F). (Image 1 shows the normal state, Image 2 shows the heat-reactive state) I bought this from a friend, but I already own several, so I'm offering it to someone who wants it. I plan to start an auction at 300 yen when it gets around 15 likes, so please like it if you're interested. #geekoutstore #stoneisland #cpcompany #ideasfrommassimoosti