Does any one have a pattern for a bit warmer? & what to fill inside of it thats microwavable & horse safe?

There are ones you can order off line that arent that expensive but making one would be so much more fun!

 A small rice bag would work just fine.

Yup, brown rice

 I realize this isn't what you're asking, but I just keep the bridle in the car, so the heater warms it up. 

That wouldn't work if the drive was only a couple of miles or if the horse was at home,or maybe if you had a really long walk between the parking lot and the barn. 

I drive about 15 miles, and it works well. 

I found a few online & they were simple to make, no hot-hands needed! they are filled with shelled corn! & That will hold heat for 20 mintues! (= I'm thinkin about getting some nice tough flannel fabric & make a few for some horsey friends (=