The weight of a T-shirt depends on its fabric and design, but generally speaking, a 300g T-shirt is heavier than a 270g T-shirt. However, this does not mean that the heavier the T-shirt, the better. Different fabrics and designs will affect the comfort and appearance of wearing.

For heavy T-shirts, the number of pounds is usually above 200g, which means that the fabric is thicker than ordinary T-shirts, so the wear resistance and deformation resistance are better. This kind of T-shirt is suitable for summer wear, because it can solve the dew point problem and give people a solemn feeling.

But a 300g T-shirt may be too thick, especially in summer, which may make people feel stuffy. Therefore, if the fabric and design factors are considered when choosing a T-shirt, then a 270g T-shirt may be more suitable for summer wear.

In short, when choosing a T-shirt, you need to decide according to your own needs and preferences, not just considering its weight. Comfort, design and appearance are equally important.