Protein-based textiles. such as wool and silk. possess special properties and they are ranked higher on the hierarchical scale than the cellulosic ones (e. g. https://www.ealisboa.com/quick-offer-NEW-LED-Illumivein-Vein-Finder-Transilluminator-to-Find-Veins-for-Phlebotomy-and-IV-must-buy/