Non-marking rubber outsole leaves no trace. Elastic gore for easy on & off. Slip-on design for easy on and go. Eco Anti-Odor for natural odor control. Recycled PET plastic. Original Fit�CIconic KEEN fit with generous space across forefoot for toes to spread out. Recycled PET plastic upper. Higher-traction rubber outsole. Fleece lining for warmth. Removable PU insole for long-lasting comfort. Gently brush with a soft, damp sponge to remove loose dirt. Treat stains right away with a gentle cleaner. Air dry away from heat.