While synthetic hair will be a sticky ball after burning and will release black smoke. The quality and lifespan depends on how they are worn and how carful they are taken care of.Using the gentle shampoos,drying it in a low heat hair conditioner,use oil conditioner to nurnish it carefull will prolong its lifespan.While improper shampoos/conditioners,frequently using heating tools,dyeing,heavily styling will shorten the lifespan of the product. Your hair Can Tangle due to dryness,oil & dirt buildupsalt waterchlorine and not combingwide tooth comb out your hair dailymake sure to wash & condition your hair at least once a weektwice a week is betterUse hydrating drops or consult your stylist for more help. Please running the hair with your fingers or Wide-toothed combs to prevent the shedding.For curly hair,please donrsquot use the comb.Secondly,after wash hair please make sure the hair with some hair oil,then the hair will be silk and soft. It is virgin hair,so could be dyed and iron-flat,iron flat please donrsquot exceed 150°,or the hair will be destroyed.Also the hair will come back to itrsquos natural wavy after you wash it or iron-flat. Our mens hair units perfectly solve the troubles caused by mens hair loss or thinning hair. You can wear it for any occations, whether it's sports, parties, dates, weddings or the outdoors.