Outdoor Research Alpine AscentShell Bivy Outdoor Research Alpine AscentShell Bivy Purchased new, only used for one night, in excellent condition. Images 1.2.15 are reference images. This bivy features the lightweight yet highly livable and breathable 3-layer OR-exclusive AscentShell 3L material. Its high breathability keeps condensation to a minimum even during the rainy season and winter, providing peace of mind even in bad weather. The size is US size, so it has enough space inside to comfortably sleep while keeping your backpack, shoes, and cookware in the foot or head space, and it weighs only 528g, making it a lightweight model. Compared to shelters, it has excellent airtightness, allowing you to use a sleeping bag one rank lower, contributing to overall weight reduction. It features a large opening from the head to the abdomen, making it easy to sit up and get in and out. You can cook, chat, or fall asleep while stargazing while feeling like you're in a small shelter. It's a semi-freestanding bivy with a wire frame at the head. The freedom to choose your bed for the night without worrying about the surrounding trees is its greatest appeal. The large zipper allows for quick ventilation, minimizing condensation, which is also an advantage of choosing this model.