Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: We hve been fighting with bed bugs. Do these pillow covers work to protect against them?
Document: The Luna encasement and mattress pads work so well that we bought the pillow covers to protect our new pillows.
I bought these pillow covers after searching many local department stores...can't believe no one had them, even BB&B; did not carry them.I have a husband who sweats a lot, so I needed something to protect our feather pillows...this was the ticket! they work great, very soft to touch, so it does not feel plasticy at all and washes up like a dream! Glad I found them on Amazon :-)
Good hypoallergenic pillow protector and it's zippered to protect you against bed bugs. I gave it 4 stars because the terry material could be a little softer. Recommended
We bought these covers to protect our new pillows and reduce allergens. They work great and can be washed if needed.
I needed something to completely protect my down pillow - including water proof... but with no crinkly sound. This cover is perfect. It allows the pillow to breath which is required. The outside cover reminds me of Terry Cloth.. not exactly but similar. The zipper doesn't lock with a cover as I've seen in other bed bug brands but that wasn't an important need for me since my primary use wasn't for bed bugs (thankfully).
I wanted to protect my new expensive down pillow from the yellowing gunk that comes out of my body, especially my face, while I sleep. The plastic lining of this protector is done in such a way that the protector remains soft and pliable. I am happy to find that the protector makes no noise when I smash my pillow up as I sleep. I have no allergies nor problems with liquid and bed bugs so I can't comment regarding the effectiveness of this protector against those.
If you google bed bugs, you will buy one of these ASAP. They are so gross!!! The little dust mites poop out dust. So sick and filthy. I recently was diagnosed with a dust allergy. I went out and got one immediately. It is a little hard to install, and you should have two people. After that it works well to protect your mattress.
Luckly I never had a case of bed bugs to test these covers. However, they do fit really well and you never know they are under your pillow case.
This pillow case protector is perfect. I bought a new mattress and new pillows, so I wanted to purchase covers for them to prevent bed bugs. At first I figured I could go cheap, so I purchased local pillow/mattress protectors that were vinyl. Unfortunately, the protectors were cheap in both price and quality. Each time I moved around on the bed or pillow there was a noise of plastic rubbing.
I had ordered two of the Luna Pillow Protectors and may order more. These are comfortable (unlike normal waterproof covers which are more plastic)and help protect the pillows from damage.I highly recommend them to anyone who has problems with young children or pets who are having accidents in the bed or for those with allergies.A good bargain.
Answer: Yes, they help. They're hard to pull a pillowcase over because of the fabric they're made of - it's like terry cloth (towel material). So I recommend getting pillowcases that are a bit larger than the ones designated for your pillow (e.g. if you have standard size pillows, use standard pillow covers and queen size pillowcases). That will make it easier to pull them over the pillowcase covers. Another option is to get pillow covers made of a slippery material. I have some of those, too, and they work very well - got them at REI.