After spending two years in R&D rebuilding our 100 Year Hoodie to combat fire, rain, wind, snow and cold, we decided to take the same technology and use it to make a pair of weatherproof sweatpants.

While the 100 Year Sweatpants look and feel like a normal pair of sweatpants, they’re infinitely tougher, as they’re built from a material that started life in a warzone. Constructed from a three-layered fabric originally developed for the elite military, every pair is milled in the US before being manufactured at one of the most technologically advanced factories in the world.

With a soft, warm, engineered fleece next to your skin, water repellent membrane and fire repellent outer shell, these warm winter sweatpants are designed to last for the rest of your life.