Bras, C cup
A C cup corresponds to a difference of approximately 16 centimeters between the bust circumference and the underbust circumference. This is the point at which bra construction begins to genuinely impact comfort. In practice, the letter describes the difference in circumferences, not the absolute size of the breasts: the same cup size for a 70 and 90 band will be a completely different volume.
From a C cup upwards, it's worth paying attention to the width of the underbust band and whether the underwire fully encompasses the breast up to the armpit. Compression sports bras can still work, but for running, a model with separate cups will be more effective.
Check your size with two measurements: measure your underbust circumference tightly, on an exhale, and your bust circumference loosely, at its widest point. The difference indicates the letter, and the underbust circumference indicates the number. Each size has sister sizes: the same bust will also fit in a band one size smaller with a larger cup letter, and in a band one size larger with a smaller cup letter. If your size is temporarily unavailable in a specific model, this is the first place to look.
The underbust band should lie horizontally and allow two fingers to be pulled under it; the underwire should rest on your ribs, not on your breast; and the straps should not leave marks. Wash in a laundry bag at 30 degrees, fastened, and dry flat. Free delivery on orders over 199 PLN, 14-day returns.