Rather than using nitril glove liners, use silk liners (like these
http://www.motorcycle-superstore.com...ove-Liner.aspx) theyll keep your hands comfy for another 10-20 degree drop.
I also have a pair of rechargeable battery powered heated gloves I bought at a MC show a few years ago. They have a rechargeable battery pack on the back of the wrist, are waterproof and insulated. They'll keep hot for about 3-4 hours; but I only turn them on when my hands start getting really cold and then turn them off again, so if I husband the charge, I can get a full day's ride out of them in decent comfort.
And there is always: derf, you can borrow one of mine.....
