I don't know why they say they are tested by Danish Olympic athletes. If they are treated, they are little tested. I wore this while going through the mail. About 36 degrees. Didn't wear it on the way back because it didn't work. I ordered to put it on my head, the knitting stretched so much that the holes were big enough so that it didn't hold the heat on my head. No hat was as good as a hat. She also crawls a lot. Don't cover your ears for more than a second or two. So I returned it. I would not recommend this hat to a grown man.
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