Hmm.. worth looking into. It's better not to turn the grips on on a warmer day. The "low" setting should, I think, be labelled "1st degree burns" and the "high" should prolly be 2nd or 3rd degree.
I'm exaggerating of course...but they get well hot. It would be nice to have a more finely graduated scale. It's hard enough doing me needlepoint with these bunches of bananas, without having the fingers burned off.
This is me just wimp-twaddling: I love the grips, and am really glad that they've got the oomph to keep my mitts alive in the mountains.