The term "jacket base" can refer to a few different things. In the context of clothing, it can refer to a thin, lightweight layer of clothing that is worn next to the skin. This type of jacket base is often made from synthetic materials, such as polyester or nylon, and it is designed to wick away moisture and keep the wearer warm.
In the context of sports, a jacket base can refer to the base layer of a team's uniform. This type of jacket base is typically made from a heavier material, such as wool or fleece, and it is designed to provide warmth and insulation.
Finally, in the context of manufacturing, a jacket base can refer to the foundation or framework of a jacket. This type of jacket base is typically made from a sturdy material, such as cardboard or plastic, and it is used to give the jacket its shape and structure.
In the USA, there are many companies that manufacture and sell jacket bases. Some of the most popular brands include Patagonia, The North Face, and Arc'teryx. These companies offer a wide variety of jacket bases to choose from, so you can find one that is perfect for your needs.
If you are looking for a jacket base in the USA, you can find them at most sporting goods stores and outdoor retailers. You can also buy them online from a variety of retailers.