Hair extensions can be used to quickly and simply fill in the sides or back nape area of your hair to instantly give you fuller hair. Application cost $150-$200 for 25-50 strands. Keratin Fusion bonds work with your hair and expand and contract with it so you can style and go about your daily activities. Extensions may not be for everyone. If hair is thinning, excessive shedding or fragile I would recommend first seeing your physician to see if internaly their could be challenges that can be addressed and second visit your hair stylist to be put on hair repairing focused hair products. If your hair is in good condition and you want fuller hair you have to experience what extensions can do for you!