Beanie if it’s 40’s. If it’s below that, I have a super light, but very warm, apex synthetic ‘hoodlum’ from Enlightened equipment. It weighs about 2.5 oz I think. Not only is it great for use with this bag or a quilt, you can continue wearing it around camp once you get up. Super versatile. I also have a pair of apex booties from them that weigh under 2 oz that are for use only in the shelter and bag. No reinforcements on the bottom. They keep your feet extra toasty in cold temps.
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