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This review is from: Buff Wool Buff Multifunctional Headwear (Sports)
This is a very versatile item which is lightweight and packs down very small. It can be used as a hat, a balaclava or a facemask. I tend to use mine to cover my mouth and nose when it is very cold. It is thin but it does make a difference and your breath can pass through it reasonably easily. It's not cheap and there are cheaper versions which don't use merino wool. But I love the feeling of merino - slightly cool on the skin.