love the idea of the heat reactive and the technology is great. just don't know why you'd be wearing a jacket at the temperature that it changes at? unless you like showing off those sweaty armpits ;) aha
oh it doesnt need the 27 degrees like the label says. the process of colour changing starts earlier, if you wear a tshirt and this lightweight jacket and you are in the sun, the colour already starts to change. i could enjoy it on sunny days when you needed a jacket.