The special lining in this cap is for medical use, when the scalp is extra sensitive. There are adjustable Velcro tabs in the back to adjust the size within a ½". This wig is made of the highest quality human hair called Super Remy Human Hair which is the finest hair on the market today. Super Remy Human Hair wigs use the complete hair strand including the cuticle which retains its ability to remain tangle-free and retain its original luster. Wig Pro cap construction is the finest on the market and always has been. This Super Remy hair is also referred to as Virgin Remy Hair where the quality and life has not been bleached our and re-died.