A knitted headband will keep your ears warm when the air outside is at a temperature less than comfortable. You can also adapt these instructions to make a lighter, thinner headband that can be worn in warm weather to hold your hair off
How to Knit a Headband (with Pictures) - wikiHow
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How to Knit a Headband (with Pictures) - wikiHow
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How to Knit a Headband (with Pictures) - wikiHow
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How to Knit a Headband (with Pictures) - wikiHow