Roughly speaking, any blanket consists of a cover and a filler.
In order to prevent the material inside the cover from bunching up, cassettes or quilting are used in production - this is where the roots of the names of the two types of blankets come from: cassette or quilted.
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In the process of manufacturing such blankets, the filler together with the cover is stitched lengthwise and crosswise. In this way, the product is divided into squares, and in each of them there is a piece of foam rubber, which has been “deprived” of the ability to bunch up at the corners.
You have probably come across blankets that are stitched not into squares, but in a figured pattern. This “phenomenon” is called karostep and is no different from the variant described above.
In this case, the blanket seems to consist of separate blocks. Each such block is filled with the appropriate material, then they are all sewn together and then “migrated” to the cover.
Typically, down is used as a filler in such blankets. Due to the ability of this material to bunch up inside the cassette, dry cleaning is recommended for down products.
Here is the answer to the question of which blanket you can clean from dirt yourself, and which only with the help of professionals.