The Arc LT Weight Shell Jacket is built for high-output activity in variable conditions, combining rain and wind resistance with unrestricted movement. Its 3-layer, 4-way stretch construction keeps the jacket close to the body without limiting range of motion, while full seam taping ensures reliable waterproof performance. Underarm ventilation manages temperature during aerobic effort, and an adjustable hood, along with waterproof pockets, rounds out the functional design.