This is Patagonia's ultra-classic insulation (padding), the "Nano Puff Jacket." It's so well-known that owning one is truly invaluable, a true "masterpiece." 【Product Features】 It's surprisingly lightweight and compact, yet provides excellent warmth. The "PrimaLoft Gold" used in the padding retains its insulating properties even when wet, providing peace of mind in unexpected bad weather. Unlike down, it can be easily washed in a home washing machine, making it very easy to care for. The outer shell is windproof and water-repellent, effectively repelling light rain. The brick-shaped quilting pattern not only adds to the design but also prevents the padding from shifting, maintaining its performance over a long period. 【Versatile for Various Situations】 ・As an outer layer over a T-shirt in spring and autumn ・As a mid-layer (intermediate layer) under a shell in winter ・It's packable, with the jacket stowing away in its inner pocket, making it ideal to keep in your bag for travel or as cold-weather protection during summer mountain climbing.