Both options are a great choice as a semi-permanent hair extension solution, and they can also be used together for an even more flawless, fully bodied look.Ultra seamless tape in extensions are the next best thing in hair extensions. With a tiny, sew-line-free bond, these extensions are discrete enough that you can use them in thin hair. These extensions are also lightweight and available in four different lengths.Invisi-tape in hair extensions use an injection bond skin weft that blend effortlessly into your natural hair making them virtually undetectable. These extensions are the closest tape in extensions solution you can find that looks 100% natural. These extensions are only available in 18” length. Optional: For the ultimate seamless look, use Invisi-tape in extensions on top of a section of hair and an Ultra seamless tape in extensions underneath. This way you get a totally invisible layer of extensions on top, plus your chosen length underneath.