The Mac in a Sac Women’s Ultralite Waterproof Jacket in Navy is a lightweight stretch running shell designed for wet-weather training, commuting, and fast-paced outdoor sessions. With a streamlined cut for comfortable movement, it provides reliable protection without feeling bulky, making it ideal for road runs, hill workouts, and everyday active use. The jacket is highly packable and stores into its own pocket, so it’s easy to carry when conditions change.
Engineered with a 2.5-layer construction and fully taped seams, the Ultralite combines waterproof performance with breathability to help manage moisture during higher-effort runs. The stretch fabric supports freedom of movement, while the windproof build helps cut chill on exposed routes. An adjustable hood with a wire peak offers stable coverage in rain, and two front zipped pockets secure essentials. Reflective detailing adds visibility in low-light conditions.

• Highly waterproof rated fabric (10,000mm) with fully taped seams for dependable rain protection
• Highly breathable performance (16,000mm) with 2.5-layer construction for moisture management
• Outer fabric: 96% polyester / 4% spandex stretch material for flexible, comfortable movement
• Windproof shell with adjustable hood and wire peak for stable weather coverage
• Packable design with two front zipped pockets and reflective detailing for practicality and visibility