it fits sheets

Blanket Cover
A blanket cover is a very lightweight decorative covering that is layered over a blanket, almost like a decorative top sheet. A blanket cover is often used on hotel beds as the outermost layer over a blanket, protecting the blanket so it won’t need frequent laundering. The fitted sheet, flat sheet, and blanket cover can be pulled off the bed and washed in a single load. Blanket covers are usually poly/cotton blends, requiring very little attentions; no ironing necessary. 

...
  • Another benefit of using 100% cotton thread bedding is its hypoallergenic properties1000 thread bedding. Cotton is naturally resistant to dust mites, a common allergen that can disrupt sleep and cause respiratory issues. By choosing pure cotton bedding, you reduce the risk of allergies and create a cleaner sleeping environment, which is especially important for people with sensitive skin or allergies.
  •  Plus, queen-size cotton-polyester blend sheet sets are available, ensuring you'll easily find the perfect fit for your bed.  Featuring deep pockets and elasticated edges, these  cotton-polyester blend sheet are designed to stay in place and provide a comfortable, secure fit for your mattress.