What kind of fabric is a sweatshirt made of? What does a sweatshirt look like

Sweat jackets are usually made of synthetic fiber fabrics such as polyester and nylon, and some products may have silver ion coatings or mesh designs added. Sweat jackets mainly use sealed materials to accelerate local body temperature rise and promote sweating. Common styles include long sleeved hooded tops paired with long pants, and some designs add breathable holes under the armpits, back, and other areas. The core function of sweatshirts relies on the insulation and quick drying properties of the fabric. Polyester fibers have high strength and are not easily deformed, which can effectively lock in body heat and create a stuffy environment. Nylon material is lightweight and durable, often blended with spandex to enhance elasticity and make it easy to wear during exercise. Some high-end products may add a silver ion coating on the inner layer to inhibit the growth of bacteria in sweat, but it may reduce breathability. Mesh structures are mostly distributed at joint movements, maintaining heat balance and avoiding excessive stuffiness.

Specially designed sweatshirts will use a double-layer fabric structure in areas prone to sweating, with the inner layer of moisture absorbing and sweat wicking fibers quickly dissipating moisture, and the outer layer of waterproof film blocking air circulation. Elastic cuffs are often used at the waist and cuffs to prevent heat loss, and the reflective strip design on the back ensures nighttime exercise safety. Some products will be labeled with weight parameters, and fabrics weighing over 300 grams per square meter have more significant insulation effects, but may affect their flexibility during movement.

When choosing sweatshirts, attention should be paid to actual exercise needs. For high-intensity training, it is recommended to choose styles with breathable windows under the armpits to avoid discomfort caused by high core body temperature. After daily use, the fabric should be cleaned promptly to avoid salt corrosion, and stored away from direct sunlight to extend the life of the silver ion coating. When paired with sports underwear, it is recommended to choose moisture absorbing and quick drying materials. Electrolytes should be replenished in a timely manner before and after exercise to maintain water salt balance.