Comforters cover the mattress, but not the box spring. Since the top and bottom fabrics of a comforter are quilted together with a filling material in between, they are usually fluffier and thicker than a bedspread or coverlet. Comforters are usually used with a dust ruffle to cover the box spring. Comforters are usually too short to cover the bed pillows, therefore most people use shams. 

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Comforter Sets – Bed Bath & Beyond
Comforter Sets

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