whether you are an urban leisure group or an ordinary weekend outing enthusiast, whether you are doing long-distance hiking and mountaineering, or professional exploration, ice climbing, or even climbing seven or eight kilometers of snow-capped mountains, an "all-weather" jacket that suits you is your essential choice. The general jacket is mainly reflected in the waterproof characteristics. In terms of fabric design and processing, the general jacket is "PU waterproof coating+glue pressing at joints". PU waterproof coating refers to the treatment of attaching a waterproof coating (PU polyurethane) to the fabric on the surface of clothes, and the thickness of the coating varies according to needs. This waterproof coating is widely used in national defense, automobiles, buildings, furniture, and even condoms. Even the lining of fire hose has PU polyurethane coating. Practice has proved that a good PU coating will not leak water. As for glue pressing, it is mainly a special glue pressing treatment for the PU coating on the stitches and seams of clothes, which is easy to be damaged and seeped. Generally, a professional glue pressing machine and adhesive tape are used to press glue at the seams at high temperature to seal all the seams, so as to further prevent water leakage and seepage. Its disadvantage is that the clothes are not breathable and windproof. From the perspective of modern mountaineering, the jacket should have several conditions: first, the structure meets the requirements of mountaineering. Mountaineering is often carried out in harsh environments, including weight-bearing walking and technical climbing. The structure of the jacket should meet the requirements of these activities. Secondly, the materials must meet the requirements of mountaineering. Due to the special environment and needs of mountaineering, the materials of the jacket must meet the requirements of windproof, waterproof and ventilation.