As deceptively warm as the kilt is, there does come a point where it's harmful to have any skin exposed for an extended period of time. If your face can handle it, your knees and lower thighs can probably handle it. To me, it's cold when I step outside and my moustach instantly freezes. But as I see it, it can be really cold, but it's the wind that's the killer. Sort of the "It's not the heat, it's the humidity" philosophy.