Microfiber is 100 times thinner than a human hair and 10 times finer than silk Micro fiber towels will not scratch surfaces, however they can pick up and trap particles that will scratch Our Microfiber TEK Towels are 300GSM with a dense split knit and are very economically priced blend of 70% polyester and 30% polyamide split into microscopic wedge shaped micro filaments They can be washed over 100 times and be reused over and over.