A cotton bra is simply a bra composed either predominately or 100% of cotton. A cotton bra has several advantages. Among them, cotton bras are very comfortable, and women with sensitive breasts who get discomfort from most bras will particularly appreciate the soft feel of cotton against their skin. Cotton bras also absorb moisture so it keeps your breasts cool in hot weather and helps to minimize sweat.
Cotton is a durable fabric that wears well and typically lasts a long time. It is important to remember that a cotton bra should never be dried in a dryer because it is prone to shrink. An example of a fully cotton bra is the Exquisite Form Fully Cotton Bra 535. You may also find comfort in cotton bras that are more of a blend, and will have more elasticity in their fit, such as the Anita Jana Cotton Material Bra 5427. You can check out both of these cotton bras and more.