Fusion is generally the preferred method as fused hair extensions can last up to 3 to 6 months with skilled application and proper care. With fusion hair extensions, extension should be indistinguishable from your natural hair. If properly applied, the attachment site should be virtually invisible.
Fusion hair extensions can be applied in different ways: hot or cold fusion. Hot fusion or bonding uses hot glue to attach extensions to the hair. This is the most traditional method. While it does have many happy followers, others say that the group causes extensions to feel stiff and unnatural. These extensions can last up to four months.
Cold fusion is a new method, and is meant to be gentle for the hair. This method uses a keratin-based polymer to attach extensions to the root. Has this method uses no heat, it is good for fine or thin hair. The polymer offers more flexibility than hot glue, and result in more natural feeling hair. For cold fusion hair extensions, many hairdressers use SoCap extensions and a clear bond. These extensions can last up to six months.