20% of the outsole is made of recycled rubber, which helps to scrap waste and reduce the carbon footprint emissions going into a more conscious environmental impact, keeping the same performances and standards of virgin rubber. CAMPER Twins - Slippers for Girls - Grey, size 10. CAMPER - Gray natural wool kids' slippers with Hook & Loop closing system. Born in 1988, our classic TWINS concept — opposite yet complementary - challenges the idea that shoes must be identical and lives on in these mismatched kids´ shoes to form a truly unique pair.