Scientifically proven effect! Temporary 40% discount! Used by hundreds of thousands of people.   The Ergolution - Ergonomic Vertical Mouse has the best price/quality ratio out of all the ergonomic products out right now. This is really the top segment of the vertical and ergonomic mice because it combines comfort with an ergonomic design and the best price. The Ergolution - Ergonomic Vertical Mouse is designed in such a way that it is suitable for all types of hands and sizes.