These wellies are made from a natural, flexible and lightweight rubber so they can be rolled up and down for easy carrying or packing. There really are so many more features to explore (including a reflective back strip for safety when the grey clouds make it a little darker!) Psst... when storing the boots ensure you unroll them so they stand upright until their next use. This product is FSC®-certified containing natural rubber from certified responsible sources and promotes environmental best practice to protect the world’s forests.