This kind of warmth-keeping type is mainly for the long-term winter wear in the alpine areas or the colder Antarctic and Antarctic regions. Usually, it uses a very thick, completely wind-proof, waterproof and wear-resistant outer material + a lot of velvet and duck down. It has a relatively large self-weight, and generally belongs to the extended garment, so as to ensure that other warmth-keeping clothes can be easily put on inside.
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