Women's Gradient VestWhether youre training, competing, or recovering, your performance depends on staying in your comfort zone as long as possible. Like the AT Hybrid Vest, the new Gradient Vest has full length, windproof panels to keep your core warm and stretch side panels for range of motion and comfort. 37. 5 insulation is chemical free and has an extreme weight to warmth ratio. Performance clothing powered by 37. 5 Technology removes moisture before it turns into