This is a really weird USB 'TechSnack'!  

Background: For seating, the Japanese use tatami mats that consist of two layers - a straw core and a woven reed cover edged with cloth. Traditionally people sit or kneel on these mats.

Now, here comes a USB version of the Tatami mat! 

If you plug this into a regular USB port, the mat will heat to around 36 or 38 degrees C.  According to the manufacturer, it will 'enhance your blood circulation, improve healing and activate metabolic reactions'.  Riiiiiiiiight!

Now, if it only came with a 15oo watt power supply!