Calvin Klein Reversible

Wrapping up our list is none other than the Calvin Klein Reversible Sports bra. This incredibly comfy sports bra provides medium support for smaller breast sizes, and does not need an elastic band or padding - unlike some of its competitors.

In addition, the seamless and silky fabric of this Calvin Klein Reversible bra has passed all of our durability testing. Hence, it has become a consensus favorite, particularly among B-cup testers. We got responses such as "it provided the necessary support without feeling restrictive" and "it felt as if I was not wearing anything at all while working out, just like a second skin."

Furthermore, the seamless construction also eliminates any threads or protruding seams that might create pain or friction during exercises. It is a straightforward racerback layout that's perfect for upper-body mobility. And last but not least, this bra is reversible, which means you get two styles of bras for the cost of one.

Ratings: 4.5 stars (from 913 reviews)

Price: $23.70 - $39.50

Buy it at: https://www.amazon.com/dp/B015PFXXSU