Natural rubber in its raw state is a plastic material which is added with different chemicals and converted into an elastic material through an heating process called vulcanisation. The various parts made of different materials are cut and quality controlled one by one, glued and assembled. About 70% of the this process is hand made in order to meet the different users requirements. As a result of it the Spirale rubber boots are soft, flexible, safe and comfortable at both high and low temperatures. Natural rubber is often combined with neoprene flex-foam for extra cold insulation and comfort.