Tama long-sleeve ramie shirt from ZIMMERMANN featuring sky blue, ramie, front button fastening, classic collar, long sleeves and box-pleat detail. Conscious: The upper of this sneaker is made using 100% bio-based materials and the sole is entirely biodegradable, as analysed by an independent environmental life-cycle assessment (LCA). Bio-based and biodegradable materials have a lower environmental impact than conventional materials.. Learn more about what makes a product Conscious on our Conscious Criteria page.