The Revolution Unbreakable is the only polycarbonate drinkware that combines key features like narrow hips for low heat transfer, wide bowl for hops profile accumulation, narrow neck for aroma focusing, and flared rim for a full flavor experience. In other words, it’s a piece that’s truly revolutionary. Bold Drinkware is constructed from the highest quality premium polycarbonate and is built to last. Features: Luxury Polycarbonate