![]() Polyester: Polyester is another synthetic material that is widely used because of its insulating qualities. ![]() These are also less expensive than other sleeping bags. Nylon bags are usually used as an outdoor gear or camping gear. Nylon: Nylon is the most common material used in sleeping bags. ![]() Sometimes, the shell is made of cotton with a synthetic filling. For sleeping bags, the combination material is usually something synthetic that is more temperature-insulating than cotton.
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