Various methods are used to attach hair extensions to a user's hair. According to one method, a user's hair is parted and adhesive tape of a first extension is attached to hair above the part. The first extension and attached hair are lowered, and a second extension is positioned above the lowered extension such that adhesive tape of the second extension substantially aligns with the first extension's tape. The second extension's tape is attached to the user's hair to sandwich the hair between the two extensions. According to another method, a user's hair is parted and a first adhesive tape on one side of an extension is attached to hair below the part. Hair above the part is lowered and attached to the extension's other side using a second tape. A third tape is attached to the user's hair below the first tape to seal the hair between the tapes.