The material of the socks ,we use the best combed cotton yarn. The yarn can not be colour fading。The colour fastness above 3. we have all kind of socks ,in the picture ,the first one and the fourth and the fifth one ,they make by 200N single needle machine,the machine import from the ITALY.the quality is very good.the second one make by 168n double needle machine,the third one make by fivefinger machine,the fivefinger socks is weard very comfortable,can prevent athlete's foot infection.our socks are suitable for people of all ages.