Bosaco Men Comfort House Slippers Leather/100% Sheep Wool Lining Leather Made of ECO Leather on the Outside and Natural Wool Inner sections of the slipper ECO leather is produced without the use of chemicals harmful such as chromium IV, PCP and AZO dyes. ECO leather process doubles the EU standards followed by the EU, making it twice as progressive and healthier for people and planet. EVA sole (ethylene vinyl acetate) Holes for ventilation Made in Europe