|They have different sizes: single, queen and king.|
I have used this for almost 10 years now. The material is super smooth and the sewing is very tiny to ensure minimal gaps.
Our mattresses, pillows and bolsters are all encased in this. The best way to using this is to wrap your stuff when they are new. That will minimise dust exposure and thus minimising dust mites (dust mites thrive on dust).
But you can do so with your old stuff too.
|The DeMitze cover.|
|They have dust mite spray too, but I have never bought this nor have I used this.|