World"s Softest Women"s Cozy Slippers the coziest slippers by far! These are not your ordinary slippers—with a name like World"s Softest, it"s easy to see why! Ultra-soft acrylic fibers coddle feet with warmth and gentle texture, while durable nylon fibers add stretch for a longer-lasting, non-binding fit. The foam-padded footbed cushions your steps. Plus, the non-skid bottoms help ensure each step you take feels more steady.