Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: How many microns are the fabric holes that allow/prevent dust mite particles? (Please don't respond unless you actually know)
Document: We bought this as a buffer between our duvet and our duvet cover to keep the dog hair and dirt off the duvet and help prevent ruining the duvet if there were any &#34;accidents&#34; by Chihuahuas. I love the fabric( firm and crisp) and it does just what we'd hoped. I only wish that it came with a way to tie to the outside cover.
Order arrived quickly and as expected. We bought it worried about dust mites. We have not experienced any significant change in allergic reactions, so don't know what to attribute to it.
This cover is very nice. The zipper is of good quality and it is not that plastic feeling so often found in dust mite covers.
I purchase this product because of my dust mite allergy, and it really help while I use this product. I hope it will last long.
Only con is the cover gets wrinkly and stiff after washing, but it's never bothered me and it could be because I use dust mite detergent and dry it on extra heat.
We had to stop using our down duvet because the down was actually coming out of it even though it was inside the duvet cover. This caused many sneezing and nose-running ridden nights as well as mornings. I was contemplating on getting rid of it since it was just sitting in storage.After doing some searching online, I found some allergy duvet covers and found that this was one of the least expensive ones. I didn't want to spend too much to find out that the cover didn't work.
I love this comforter dust mite protector. It went on easily enough and protects my comfortor and me, from the evil little dust mites! While I felt it was expensive, it turned out to be well worth the money. I am very pleased with this product.
In an effort to help my dust mite allergy, I bought two of these covers - one to be the dust mite barrier over my duvet and one to be the cover on top of that, which I wash every week. You are not meant to wash dust mite covers because it loosens the threads so that mites can get through. You will love two features about this cover: the zip ( instead of the usual buttons) and the corner ties inside the cover that keep the duvet in place. Briliant!
I wanted something to cover my duvet when I use it with my duvet cover. I actually use my regular duvet cover on top of the protector just as an added precaution against dust as well as preserving the life and quality of the comforter. Add this protector along with the duvet cover certainly adds a little more weight to my comforter but its not a problem. I was thinking about getting duvet donuts but am unsure if they will really work.
Love mite protectors to keep bedding clean.All my mattresses, duvets and pillows are protected.5 more words required. haha.
Answer: Micron count is 4.91.