Our premium quality LONGROOTS yoga mats feature unique, beautifully laser-engraved designs (meaning that no synthetic inks were used during production). Our yoga mats are comprised of natural cork & rubber. Cork is considered highly sustainable because, unlike most other building materials, cork is biodegradable, recyclable, and self-regenerative. In addition to being highly sustainable, cork is antimicrobial, meaning it's effective in suppressing the growth of microorganisms.