Anything with a wipeable surface would be a bad idea as urine has nowhere to go, liners have to be absorbent. Either ready made liners you can buy online (fleece with an absorbent layer sewn In the middle) or buying a fleece blanket and putting an absorbent layer underneath yourself. Either way, it will have to go through the washing machine, so a horse bag to wash fleeces in is a good idea.
You could go down the disposable bedding route to save on washing - aubiose, finacard, paper bedding whose name escapes me right now (but some then need a layer of hay on top to make them softer (finacard certainly does need it, i use finacard as a hutch substrate but it is not soft enough for them to walk on)) and then you’ve got disposal issues and mess to consider. Plus the extra cost of replacing disposable bedding (although there are ways to make it cost effective)