Stay cozy with the OOcoozie Thermo. The mule-style slip designed for colder days, it features proprietary OOfoam™technology for comfortable cushioning that supports all of your winter recovery activities. Insulated Primaloft® surrounds your foot in warmth for days when lounging is the first and last part of your daily schedule. This lightweight and packable style is an absolute must-have to help you stay toasty.