The Autumn Shasta 3L Jacket is a heavy-duty shell built for maximum movement and durable protection, designed with a Free & Easy Fit that gives you freedom to layer. It uses rugged ShelterPro 3L fabric to provide durable defense from the elements with a powerful 20K waterproofing and 20K breathability rating, plus full seam taping to ensure you stay completely dry. For temperature control, the jacket includes mesh-lined underarm zip vents, and the helmet-compatible hood with a reinforced flex brim seals out the wind and snow.