Factory washed the hair with warm water and shampoo before shipped,at the same time , we will add some hair oil to the hair wig to protecting the hair from being dry during long time delivery, it may have some smell in the high temperature or hot weather, the smell can easily fade away after washing via any shampoo or conditioner. Promise no corn-chip chemical smell, our hair is 100% chemical-free, we do not only care about beauty but also our customer's health!