Only tried on indoors. Currently, all colors and sizes are sold out. Below is the official introduction: Introducing the WAIPER LEVEL4 WIND WAIPER.inc LEVEL4 Wind Shirt Jacket PERTEX UNLIMITED made with PERTEX material. Item No.: WP1120 This is a reproduction of the "LEVEL4 Wind Shirt," a valuable layering system from the 2000s, originally developed for US Special Forces but never officially adopted: the Military Advanced Regulator System (MARS). Like ECWCS and PCU, this system is designed for temperature regulation through layering. This series is now popular as a collector's item. We have produced the nylon shell "LEVEL4 Wind Shirt," which offers a wide range of wearability. The outer fabric uses "PERTEX UNLIMITED," a notable material from the British company PERTEX, which is used by brands beyond just outdoor manufacturers. This material leverages expertise from outdoor and military fields, offering excellent waterproof and breathable properties, making it a highly reliable fabric adopted by many brands. It is finished as a thin nylon material with moderate firmness, wind resistance, and water repellency. As the name "wind shirt" suggests, the actual product is a simple, streamlined full-zip design made of nylon. However, to enhance its functionality as an outer layer, we've added zippered side pockets. It also features an inner chest pocket and is packable for compact storage. Features include a well-fitting, stowable hood and other functional details. This lightweight and comfortable jacket offers high wind resistance, making it suitable as a wind shell. Therefore, it can be used throughout the year in a wide range of situations, from urban use to outdoor activities, with an excellent design. It is truly a piece worthy of being called a "masterpiece." WAIPER.inc has faithfully reproduced the appeal of the original while creating a product that combines stylishness for urban use with functionality for outdoor activities.