Hair extensions don’t only to include length. You could opt to add volume rather (or in addition to length), which is ideal for fine, limp or thinning hair.

Turn that bob into a hair! If your existing hair is at little as 3 inches long, you could get extensions, although the level of your improvement may be limited if your hair is extremely brief.
Extensions can be braided in, glued in, woven in, or if you just need a follicular boost for a special event – clipped in.
You can additionally add highlights or color with shades ranging from mild to wild –  to your hair with using extensions.
The process isn’t unpleasant, so it shouldn’t harm a bit.