The best men's slippers are all about comfort, so you want light and soft fabrics. That said, for shearling, fleece or wool for winter. You can go for cotton and knit if you want something breathable ...
If you do want slippers that can go indoors to outdoors, these are a solid option. Just be sure to opt for the waterproof rubber sole instead of the leather sole, which artist Marcel Dzama told us ...