RE: Cold weather bowhunting
 

As others have mentioned, I believe your drawlength is a tad to long. This is actually one of the most common problems that I see many struggle with. Shorten up your draw length and add an STS and you'll never have arm slap again. Good luck and good shootin'

RE: Cold weather bowhunting
 

shortening your draw length should be your first step, but an arm guard will also help.