Cariuma red sneaker size 8 women's

If you haven't heard of Cariuma, they are pretty cool. Sustainably made sneakers with cork insoles and cotton exterior. I love these shoes but they just don't fit my feet because I don't have a defined heal, making it slip. These are new without tags and only worn in the house. Material & Construction Upper: Cotton canvas Lining: Cotton canvas Sole: 100% slip-resistant rubber Insole: Mamona oil bio based cork insert Laces: Made with recycled plastics + organic cotton, with debossed metal aglets Construction: Handmade vulcanized sneaker; fully stitched outsole