Vollebak cofounder Steve Tidball claims that the company stands behind the 100-year guarantee, because the new pants are made of materials so tough you can walk through fire in them. Technically, the 100 Year Pants are made of an innovative three-layer material designed to withstand various threats. The outer layer repels water and is designed to resist abrasions, the middle layer is fireproof and also expands as an airbag at high temperatures, acting as a barrier between your legs and the flames, while the third layer is an aram1id fiber, a nylon-related synthetic doesn't burn or melt, offering extra protection.
"Most fire resistant clothing is made from heavy, uncomfortable, chemical laden materials, but this is the world's first intelligent material than can be comfortably worn every day, then alter its behavior in the face of fire," Vollebak cofounder Nick Tidball said about the material. "It was originally designed to help soldiers handle the most extreme situations, but without having to dress like firefighters."
Still, 100 years sounds like a long time for a pair of pants, especially if you wear them frequently? So how do you know they'll last that long? Well, Volleback put them through the Martindale abrasion resistance test, where a mechanical thumb is rubbed against the fabric until the fibres start to break. A regular polyester fabric can survive around 25,000 revolutions, but the innovative material these pants are made of passed 100,000 cycles of wear and even then, it needed to be checked with a magnifying glass to see if any of the fibres had broken. Volleback claims they hadn't.

Interestingly, this isn't Volleback's first 100 year clothing item. Last year, the company launched the 100 Year Hoodie, which was made of a softer version of Kevlar, and more recently, a jacket made of graphene jacket designed to absorb heat and repel bacteria, among other things.