Size S is suitable for men with a height of 165-170cm and a weight of 55-63kg, with a shoulder width of about 46cm, a chest circumference of 92cm, a coat length of 65cm, and a sleeve length of 62cm; Size M corresponds to a height of 170-175cm and a weight of 63-70kg, with a shoulder width of 47cm, a chest circumference of 96cm, a coat length of 66cm, and a sleeve length of 63cm; Size L fits individuals with a height of 175-180cm and a weight of 70-78kg, with a shoulder width of 48cm, a chest circumference of 101cm, a coat length of 67cm, and a sleeve length of 64cm; Size XL is designed for those with a height of 180-185cm and a weight of 78-85kg, with a shoulder width of 49cm, a chest circumference of 106cm, a coat length of 68cm, and a sleeve length of 65cm; Size 2XL is suitable for people with a height of 185-190cm and a weight of 85-93kg, with a shoulder width of 50cm, a chest circumference of 111cm, a coat length of 70cm, and a sleeve length of 66cm. The sizes are precise, and the fit is standard, ensuring a comfortable and snug fit. The jacket body is made of high-quality cotton fabric, which is soft and breathable to the touch, ensuring comfort even during long wear. The seams are made of durable synthetic fiber material, enhancing the durability of the garment and withstanding the test of daily activities. The classic baseball jacket style features a contrasting stand-up collar and metal buttons, exuding a rich American retro vibe while showcasing a modern fashion sense. The loose long-sleeve design allows for ease of movement and can easily handle various occasions. The multiple pocket design is practical and convenient for carrying small items like phones and keys. The cuffs and hem are finished with elastic ribbing, not only fitting the body snugly but also effectively preventing cold air from entering.