Warm hat and mask, gloves with chemical handwarmers inside, warm pac boots. If you keep your head, hands and feet warm you will be fine. It was 10* here yesterday mornng with a 10 mph wind and it was a bit brisk. I sat for 3 1/2 hrs and stayed pretty comfortable. I might have actually broke a sweat if I would have shot the big 8 pt that walked right under my stand but my buck tag is filled already. Great morning to be out cause I like it cold.