Can't see any way a hand warmer would be a no-no.
Had a tourney last November with temps in the 30's. Thats pretty cold for us hot blooded 'suthna's. I loaned out 3 ski caps (navy blue of course) to my fellow officials, but I was stingy with the hand warmers! I found that one inside the ski cap made a big difference in my comfort zone. I've learned now to keep a supply close.
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