Toss in the wash with cold water. Air dry. Boom.
Out of the box comfort
"I’m never quite sure what Rothy size to buy but was happy to find that my normal size was perfect with these slip ons. For reference - I now only buy half size up on the pointed toe flats. I’ve worn no show thin socks and slightly thicker ankle socks with no issue. Ran through an airport for a tight connection within the first few days of owning these and had no blisters - quite comfortable. Good purchase."