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zoefkris OP t1_izaxwt5 wrote

It's apparently felt, boiled in a specific way to keep water out, it's heavy and you should make sure to wear something under it because it's like a tiny cactus, prickly.

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_twelvebytwelve_ t1_j11ssmp wrote

Felted wool is darn near waterproof. It's a treatment done to 'brush' wool so the fibres kind of interlock and create a mat across the entire surface.

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