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Okay, the thread about Fleece AIOs got me wondering about how fleece AIOs (and I guess fleece covers for that matter) work to keep water in. I know that PUL is a sort of waterproofer and Wool has natural abilities to make it water resistant and water absorbant, but how does fleece work?<br><br>
Also, I've read here and there that PUL is bad, but I don't fully understand it and a lot of people still seem to use it and sell it, so any info on that would be helpful, too. Thanks!
 

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Wool and fleece are breathable so they let some of the moisture evaporate. They sort of *sweat* so you may feel a bit of dampness but they dont leak like other fabrics.<br><br>
I dont think PUL is necessarily bad, its just not a natural fiber (but most fleece isnt either) and it doesnt breathe but its great a keeping moisture in (if cared for properly).<br><br>
Some fleece AIOs have a layer of PUL or other waterproof fabric sandwhiched between two layers of fleece so that is how they work. But I have a lot of fleece covers and never have leaks with them even when they are over only a fitted.<br><br>
Does that make any sense!? <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/wink1.gif" style="border:0px solid;" title="wink1">
 

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I use PUL for a few of reasons:<br>
* it's less bulky than wool or fleece<br>
* I can pull Anwyn's pants up easier over PUL :LOL<br>
* It sweats less than wool or fleece when it's going to be compressed for a while (e.g. car trip)<br><br>
I do have fleece AIOs, but I just use those for around the house or at nighttime. My wool is almost all around the house or for short around town trips. Oh, and I'll put her in wool for visits to the in-laws.<br><br>
There is something in the make-up of fleece that keeps moisture in. When it's next to the skin like a fleece-topped soaker, the pee goes through the layer of fleece into the absorbant material below, and then the fleece prevents it from coming back through (barring compression and the like). The outside layer of fleece also holds the moisture inside the diaper.<br><br>
Funny story: I had Anwyn in a diaper no cover the other evening. She fell asleep nursing, so I laid her down on our bed. A couple of hours later I went to check on her and realized her diaper was wet, so I changed it. I felt the bed and it was dry, so I didn't worry about it. Then when I flipped the cover back, there was a huge wet spot on the sheets! I was dumbfounded for a moment until I realized our blanket is fleece! :LOL
 

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Fleece is probably my favorite cover fabric! It works the same way as wool with the exception that it does not absorb excess liquid and it needs to be wased more often since it does not have the antibacterial properties of wool. But they really work pretty much the same.<br><br>
Fleece is not waterproof like PUL it is water *resistant*. And like the other ladies said it can sweat when compressed....just like wool. Fleece is made from polyester which in a tightly knit form is water resistant. And some fleeces have DWR applied to them as well the make them even more resistant.<br><br>
I have no problems with leaking fleece...sweating, occasionally, but no leaking! Like I said, fleece and wool are tied as my favorite cover fabric. Fleece nudging slightly ahead of wool, but only because I can wash fleece with the rest of my dipes <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/orngbiggrin.gif" style="border:0px solid;" title="orange big grin">
 
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