The Fusion Method is done by adding individual strands of extension hair (we use only 100% human hair) to a person's natural hair. The extension hair is attached using a specific bee's wax based polymer. We do not use glue or any other type of adhesive as we have found this bee's wax based polymer to be the best and lesast damaging to the hair (compared to many glues and other plastci based polymers on the market). Fusion is not the healthiest method of applying hair extensions but it can produce some of the best results. If you are willing to sacrifice some hair breakage this could be the best method for you. If you are trying to grow your hair out and maintain optimum hair health then we wouldn't recommend this method. All of the other methods we do provide flat and smooth results