Black Sunglasses for those who need sunglasses, but don't want to spend the $100+ or more required for certain name brands or have a tendency to misplace or scratch them.  And if you do have a much more expensive pair of sunglasses, why not get a much lower cost back up pair in case your primary ones get left somewhere?  Black sunglasses with UV400, covers all UVA / UVB rays, lenses that will shield your eyes from the sun's rays.