You just go to their website and pick the shade closest to your color.
There's synthetic hair, real human hair, and a mix of the two.
6 Clip-In Extensions That'll Give You Pinterest Hair
Secure the clips, working from one side of the head all the way across to the other.
Using a wide-tooth comb, gently comb through your hair to ensure that the extensions blend seamlessly with your natural hair.
Description: Note that your natural hair should be medium to thick and shoulder-length or longer for the extensions to look natural. If you have finer or shorter hair, you should skip doing clip-in extensions on your own and leave this work up to a professional so you get the best look.