In a flash of
For those handy with a sewing machine, take it a step further and make your own reheatable bra cups! Carefully slit the seam on one side of a pair of standard push-up pads and remove the filling. Add a few horizontal seams to create tubes or channels for the rice so that it does not all settle at the bottom due to gravity's forces. Fill with rice and sew back up. Anytime your knockers are getting chilled, remove the pads, pop them in the microwave, and tuck some warmth next to your heart.
Be sure to wear your t-shirt and spread the word. Life's too short to freeze your boobs off!
Gents (or should I say Greenpa?), I haven't forgotten about your problems with the cold. You can sew up a nice rice-filled fabric pad based on this design. Knowing how sensitive this topic is for you, I'd advise against advertising your little helper on a t-shirt.