I've bought from Ziggy's and my guinea pig pals, all washed on 60 degrees, my guinea pig pals didn't shrink, two out of the Ziggy liners did, the ones that did shrink were the same material design, don't know if that would make any difference, we've had to wash ours on high for various reasons. The lady from Ziggy's is a lovely person, very accommodating, she let me order a week in advance and would send the liners as soon as I paid her. The other one is lovely too but is very busy hence me buying from Ziggy's in the end. I would buy from both again because fleece shrinking should be expected with the amount of times they are washed.