It is a piece of fabric made of polyamide, polyester, or a combination of these fabrics. Each fibre used in the towel is smaller than a single strand of silk. This construction gives the microfiber towel its extreme durability and prevents it from shrinking, wrinkling, or stretching after repeated use. The polyester used in a microfiber towel also provides excellent insulation, which is why the towel dries so quickly.