Rukka bruger Cordura®, a textured polyamide fibre, with low weight, high abrasion resistance and high rip and pull strength, for the protective outer material. Cordura® stands for high heat stability. All these properties make it suitable for use in high quality protective clothing. Fabric durability: Modified Wyzenbeek abrasion test (cycles to failure). Tongue tear test: Fabrics are partially slit and the energy required to tear them further is measured.