From OOFOS, the Men's OOcoozie Thermo Mules feature:  Synthetic upper Primaloft® ultra hi-loft insulation blankets The OOcoozie Thermo is here to help yOO warm up in the cool down Get the ultimate Active Recovery for the elements Step out with OOfoam™ technology and Primaloft® hi-loft ultra insulation in a modern mule style built for colder temps OOfoam™ technology absorbs impact, so the body doesn't have to - reducing stress and helping yOO recover faster  Imported.