Ultra-lightweight, packable jacket designed for changing conditions The Women's Defend Wind Jacket isn't just a jacket; it's an essential piece of four-season riding gear. The weather can change without notice on nearly any trail and time of the year. As such, the extreme packability and highly windproof and water-resistant build make it a truly necessary piece of gear. Designed to pack into itself, the Defend Wind mountain bike jacket fits into even the smallest short or jersey pocket, so it's always at the ready.