Instruction: Answer the given question using the supporting document.

Input:
Question: Is this material allergen-impermeable?
Document: Just purchased this and I already notice a major difference. My allergies have been reduced dramatically when incorporating this duvet cover along with an allergen-free pillow, and mattress protector (highly recommend Luna products for the latter).
This duvet cover is high quality material, very well made. I am very pleased with the product. Does what it says it will do.
I love it. Material was so soft, and the duvet seemed well made. I bought another one for my sister.
The material feels soft out of e package but does not wash well. It has ties vs. clips to hold your comforter in place. What a waste of good money.
I was most pleased when I opened the package and felt the material and saw how well this product was sewn. All cotton allergy protectors are usually more expensive then the others so I was most pleased with the price.
Needed a cover to prevent feather escape from goose down bed comforter. It worked well to protect against feathers. Material is strong and shiny. I recommend a system: more softer cover- Allersoft-bed comforter.
Unlike other reviewers here this duvet cover fit my queen duvet insert perfectly. The ties are like any other duvet cover and keep the insert in place. The material is extremely soft and luxurious. I highly recommend this product.
This is a beautiful duvet cover but it has little to no allergen protection when used with a down comforter. The feathers in my three year old down comforter are coming out in small particles and stuff up my nose. I saw this online and assumed it would solve my problem. I was wrong I am still stuffy when I wake up. It will make for a good summer duvet for my new alternative down comforter. Although $75 for a simple duvet with little to no allergen protection is pretty steep.
I bought a copuon of Allerzip product before. They are expensive, but they are water proof and make me believe they can block dust from coming out of my bed. However, when I receive this product, the material does not seem to be able to completely block dust. Also, it is not water proof. next time, I will rather spend more and get a better quality one.
I hate the fact that my down comforter isn't made IN this material already, but alas! This works great-I was having to wash my duvet covers 1x per week to keep the down dust off, and dry mopped the hardwoods every other night before I got this. Cleaned the room and the duvet cover first, slipped the comforters in these and after the end of 1 week there was no feather/down dust on the floors, and the duvets still looked clean.
Answer: I dont think so.  It is definitely breathable.  Feel like cotton but it totally blocks the leakage.