Mesh outside. Lined with soft faux fur. It is large and can accommodate several baby guinea pigs or at least one adult. This takes up more space in the cage than a large igloo if you are thinking about installing a cage. I have combined several guinea pig habitats so it is not a problem for me. But if you're worried about space, keep this in mind. Machine wash is great. The gray soft fabric lets you see him pee and poop so you can tell when he needs a wash. There is a clip on the side to secure it when needed.
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