The Unisex CARIUMA Rio Brasil OCA Organic Sustainable Shoes in gray are a stylish and environmentally friendly option for those looking for athletic shoes. With a US shoe size of 8 and a EU shoe size of 39, these shoes are designed for a comfortable fit for both women and men. The Cariuma brand is known for its commitment to sustainability, making these shoes a great choice for those who prioritize eco-friendly fashion. The gray color adds a versatile touch to these athletic shoes, making them a great addition to any wardrobe.