The Swix Arendal Tights are made with Swix R.C.C. Tech fiber, a new engineered fiber with activated carbon from the coconut husk which are waste product from the water filtration industry. This new fiber enhances the fabrics resistance to moisture, odor and UV protection. The Arendal made with R.C.C. fiber will last longer than other organic options. Made with the new R.C.C. Tech Fiber Moisture resistant Odor control UV protection Swix Men&';s Apparel S M L XL XXL