A comforter is a covering used most commonly to decorate - and further insulate - a bed. Most inexpensive comforters are filled with synthetic materials such as polyester to add body, texture, and modest insulation value.

 

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While you should consult the care label for best results, most synthetic comforters sold today may be both machine-washed and tumble dried. Wash the comforter separately in cool or warm water on a gentle wash-and-spin cycle. Use “low” or “delicate” temperature settings on the dryer, and don’t dry for more than 20 minutes at a time, since synthetic fabrics generally dry quickly.

Many down comforters and others filled with natural materials are machine washable, but not in the washers and dryers found in most homes. Their small size will compress and distort the down filler. Down comforters may be cleaned either professionally or in super-sized laundromat washers and dryers. The large capacity commercial drums found in these machines will help retain the down’s fluffy texture. As with synthetic comforters, use cool or warm water and a gentle wash cycle, followed by low dryer heat.

Use a duvet cover to protect your down comforter from dust and dirt, and to help reduce the frequency of washing the down comforter. Duvet covers, like bed sheets, are easily washed at home.

Reference:

Bed, Bath and Beyond