Be in harmony with the environment in the Simple Tuba II Leather sneaker. Eco-certified leather upper in a casual sneaker style. Logo and stitching detail. Certified organic laces. Organic cotton and recycled PET lining, cushioning pedbed made of recycled materials. EVA BIO-D midsole. Partially recycled rubber traction outsole made from 40% recycled car tire and 60% natural rubber.