Whether you're training, competing, or recovering, your performance depends on staying in your comfort zone as long as possible. Similar to the AT Hybrid, the Gradient has stretch panels through the sides for range of motion and comfort. In addition, the Gradient Jacket has the benefit of having full-length front and back windproof panels with 37.5 insulation for warmth.Performance clothing powered by 37.5 Technology removes moisture before it turns into sweat, helping you maintain an ideal core temperature so that you can perform your best. Climate control clothing with 37.5 Technology has been proven to decrease the rate of core temperature buildup, increasing athletic performance by up to 26%.