The best and most useful products are those invented to fill an actual need. If you are a regular traveler you know you need to learn some basic words in the local language in order to ask some of the basic things you may need during a trip.
IconSpeak is a brilliant t-shirt invented by travelers for travelers that has 40 universal icons to solve the basic communication problems everywhere you go.
The original idea came up during a motorcycle trip to Vietnam to three Swiss guys, George, Florian and Steven. After encountering numerous language barriers they thought it would have been awesome to have an essential set of icons always at hand to solve communication issues, so they started writing down a list of icons basically everybody needs during a trip to the other side of the world.