The difference between human and synthetic hair attachments lies primarily in their composition, performance, and price point.

Human hair extensions are made from real human hair collected from donors. The main advantage of this type of hair attachment is that it behaves just like natural hair. It blends seamlessly with your own hair, can be styled (curled, straightened, dyed), and tends to have a more natural movement and shine. However, human hair extensions require the same care as your natural hair, including regular washing, conditioning, and careful brushing. They tend to be more expensive than synthetic options due to their quality and longevity.

On the other hand, synthetic hair extensions are made from various artificial fibers designed to mimic the look and feel of human hair. Advancements in technology have led to the production of synthetic hair that can closely resemble human hair. However, synthetic hair cannot withstand high temperatures, limiting styling options. It can't be dyed and tends to have a shorter lifespan than human hair extensions. Synthetic hair also doesn't blend as seamlessly with natural hair and may have an unnatural shine. On the plus side, synthetic hair extensions are less expensive and require less maintenance than human hair extensions.

On a molecular level, human hair is made of a tough protein called keratin and has a structure that includes a medulla, cortex, and cuticle. This structure allows for the absorption of moisture and contributes to the hair's elasticity and strength. Synthetic hair, however, is typically made from plastic fibers, such as polyester, acrylic, or polyvinyl chloride (PVC), which are coated with silicone to give them shine and a realistic appearance. These fibers do not have the same structural properties as human hair, which accounts for the differences in behavior between the two types of hair extensions.