Visit
www.icebreakerinc.com
I have mentioned their products elsewhere on these forums. I use both, and have no problems during deer season in northern Wisconsin. I normally carry a light pair of gloves into the woods so my hands don't freeze while climbing the treestand. After that, gloves come off, hands go into the handmuff and I'm set.
I use the bootblankets more when I'm ground blind hunting. Do not walk in them.
The products are not expensive, and can sometimes be found at Gander Mountain. Try Cabela's too, I think I remember seeing them there.