Ultra-Thin Hot Water Bottles - Undu is a Revolutionary Hot Water Bottle Design for Menstrual Cramps (TrendHunter.com)

The hot water bottle design has remained relatively the same over the course of the years. Now, however, a team led by Charlie Katrycz—a Ph.D. candidate at the University of Toronto’s Faculty of Applied Science & Engineering who is "currently researching generative manufacturing technologies"—is disrupting the market with a state-of-the-art design that is considered to be "the world's thinnest wearable hot water bottle."

Dubbed 'Undu,' the product measures just a third of a centimeter in thickness. It delivers heat therapy on-the-go in order to alleviate menstrual cramps and it can be worn comfortably under high-waisted underwear. What makes this ultra-thin hot bottle design unique is its "patented air-casting technology and manufacturing approach." The tech is said to work "by injecting fluid channels that imitate those found in blood vessels and veins within silicone materials." Charlie Katrycz calls it 'Loonskin.'

Image Credit: Undu/ Loonskin Labs