Equinoxx Stage 3 Ultra-ThermalWears like a shirt yet protects you like a coat. Thermal, wind blocking, and breathable. Comfortable even when you come in out of the cold. "This is legitimately like wearing a jacket without the bulk. It's thinner around the torso making it perfect for those that wear a ballistic vest. Wore it in 0 weather and it was great. It's a good wind stopper as well."Joel M. (Jan. 9, 2022) All you need in cold winter weather is Stage 3, which you wear under