Understanding the 40A Bra Size
A 40A bra size pairs a 40 inch band with a low volume A cup that offers a smooth, understated silhouette. It suits wearers who prefer a comfortable, more relaxed band while keeping the cup depth shallow for a neat, close settling fit.
To check whether 40A aligns with your measurements, use our bra size calculator and follow the steps in the fitting guide. To see how 40A compares with sister sizes such as 38B or 42AA, the Bra Sizes Explained guide explains how changes in band length and cup volume affect support.