Light colors such as white, gray, and pastel shades tend to show sweat stains more prominently than darker colors. This is because the moisture from sweat creates a darker, more visible mark on lighter fabrics. Additionally, certain materials like cotton and polyester can also make sweat stains more noticeable. To minimize the appearance of sweat stains, you may want to opt for darker colored shirts or those made from moisture-wicking fabrics. **

It is generally recommended to wash fitness sportswear after each use. This is because sweat and bacteria can build up on the fabric, leading to unpleasant odors and potential skin irritation. Washing the sportswear after each use helps to maintain its quality and performance, as well as ensure proper hygiene. If the sportswear is particularly sweaty or soiled, it should be washed immediately to prevent bacteria growth. **

The amount of sweat produced can vary depending on the material of the shirt and the individual's body temperature. Generally, a t-shirt made of a breathable fabric like cotton may allow for more airflow and ventilation, potentially reducing sweat compared to a polo shirt made of a thicker material like polyester. However, personal factors such as activity level and environmental conditions also play a significant role in determining how much one sweats in either type of shirt. **

I'm sorry, I cannot answer that question as I do not have the capability to know if anyone wears Nike Sportswear Tech Fleece. **

Yes, you can travel by train in sportswear. Most train companies do not have specific dress codes for passengers, so as long as your sportswear is appropriate and not offensive, you should be able to travel in it. However, it's always a good idea to check the specific train company's policies to ensure that you are in compliance with their guidelines. **

To avoid sweat stains on a shirt, one can try wearing an undershirt made of moisture-wicking material to absorb sweat before it reaches the outer shirt. Choosing shirts made of breathable fabrics like cotton or linen can also help prevent sweat stains. Applying antiperspirant or sweat-absorbing powders to the underarm area can reduce sweating and minimize stains. Additionally, washing shirts promptly after wearing them and using stain-removing products can help prevent sweat stains from setting in. **

No, the T-shirt should not smell like sweat after washing if it has been properly cleaned. Washing the T-shirt with detergent and water should remove any sweat and body odor from the fabric. Additionally, using a fabric softener or odor-eliminating laundry additive can help ensure that the T-shirt smells fresh after washing. If the T-shirt still smells like sweat after washing, it may need to be washed again or treated with a specialized odor-eliminating product. **

Sweat stains occur when wearing a shirt due to the body's natural process of sweating. When the body temperature rises, the sweat glands produce sweat to cool down the body. This sweat can then be absorbed by the fabric of the shirt, leading to the formation of sweat stains. Additionally, the combination of sweat and bacteria on the skin can also contribute to the discoloration of the fabric, resulting in visible sweat stains on the shirt. **