Simms Freestone waders are made from a durable, breathable four-layer Toray QuadraLam fabric. These waders are designed to be comfortable, withstand brushy snags, and keep you warm in cold water. , Simms Freestone Waders are breathable. They are made from a 4 layer breathable fabric. They are not as lightweight and breathable as the Flyweight waders but are a great choice at a lesser price point if breathability is your main concern. , The Simms Freestone Waders are considered breathable waders. The Freestone Waders are assembled in the USA utilizing a durable and breathable four layer material called Toray.