Short answer: extension texture should be chosen according to how your natural hair behaves and how you want to wear it in everyday life. Straight, wavy or curly is not only an aesthetic choice: it determines how much work will be needed each day to blend the two textures.
A texture that looks beautiful on its own can become impractical if it forces you to straighten or curl your natural hair constantly just to make the two match.
When should you choose straight extensions?
Straight extensions are the most straightforward choice when the natural hair is straight or is almost always worn with a straight finish. Human hair extensions can still be temporarily waved or curled, but their starting texture remains more regular.
The VELVET catalogue includes straight versions of several systems, such as VELVET Fusion, VELVET Bridge XL and VELVET Seamless.
When should you choose wavy extensions?
A wavy texture can be useful when the natural hair is not perfectly straight and forms light waves, or when you want a softer result without creating the entire style from scratch every time. The size and behaviour of the wave should still be compatible with the natural hair.
VELVET offers, for example, Fusion Wavy and Seamless One-Piece Natural Wavy.
When should you choose curly extensions?
Curly extensions work best when the natural curl is reasonably compatible or when you are willing to define both the natural hair and the extensions together. It is not enough for both to be called “curly”: curl diameter, elasticity and direction can vary considerably.
That is why VELVET distinguishes specific products such as Fusion Curly, Bridge XL Curly and Seamless Curly.
Does length change with texture?
Commercial length is normally measured with the hair stretched. A curl or wave in its natural form can therefore appear shorter than a straight strand with the same stated length. This matters when choosing the final result.
In summary
Choose the texture that creates the least conflict with your natural hair. If making them look like one head of hair requires a lot of heat or completely restyling the texture every day, the starting texture is probably not the most practical choice. If you use hot tools, see Can you use hair straighteners on human hair extensions?.