Manduka MatWare Mat Sleeve Made from 100% recycled polyester fabric--Certified by Oeko Tex for energy conservation Water-resistant recycled fabric & zippers--Durable high-tensile nylon and brushed aluminum hardware Adjustable nylon strap & sliding shoulder pad for comfort--Convenient carabiner ring to attach items such as keys or canteen Elastic bungee with cinch to hold towel, clothing or water bottle Structured bottom features protective padding and ventilation points