What kind of blanket has the sheets zipped around it?

When I was in Switzerland, my bed sheets were actually like a giant pillow case for my blanket. The blanket part was inside a large zippered sheet (kind of like a large pillow case). When one wanted to wash the sheets, one would just unzip the hidden zipper and remove the blanket part and wash it. Then you could... show more When I was in Switzerland, my bed sheets were actually like a giant pillow case for my blanket. The blanket part was inside a large zippered sheet (kind of like a large pillow case). When one wanted to wash the sheets, one would just unzip the hidden zipper and remove the blanket part and wash it. Then you could put on a different sheet/blanket cover. What is this called? Where do I get it? I'm not sure but maybe the blanket was filled with down or feathers.
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