General Fleece?

https://www.guineapigcages.com/forum/bedding/21568-fleece-project-study.html
That's the sticky on what to do and all that jazz. Have fun!

Check out the sticky the person above posted, it has everything on caring and preparing for fleece that you need to know. I definitely recommend it over any other type of bedding. It's way easier to clean, cheaper in the long run, looks better in my opinion, and the pigs love it.

I use fleece on top of used (broken link removed). The regular size will fit a 2x2 section of a cage. I use a hand-held vacuum to suck up the poops and bits of stray hay at least twice a day (sometimes I use a little hand held broom and dustpan when I don't feel like hooking up the vacuum). Sometimes I just pick up the poops by hand when I pass by and toss them in the trash (I wash my hands after of course!).

Once a week I take the bedding outside and shake it out to get the hay bits and hair off the best I can and I wash it. I have several sets so that the pigs don't have to wait for a clean cage (especially since I have to go the laundry mat). I've never been a big user of vingegar in my wash, but if the laundry starts to get smelly I'll put some in.

Age shouldn't matter for keeping pigs on fleece. As far as nibbling, tasting it is fine and they'll probably be curious and do this. As long as they aren't eating holes out of it.