look: see the towel with the light, to see the colour and lustre of the towel, generally brightly towel is not cotton.touch: cotton towel feels very soft, hard will not be cotton.comb: comb the towel by hands to observe whether shedding, if a little shedding do not be disappointed, pure cotton towels are a little shedding, this is common. not shedding smooth towels are chemical fiber towels. Be careful of towels that feel very soft and slippery; nine out of ten are not pure cotton.