We travel to hot climates and i tend to sweat through my normal bras. I wanted to try something that would be comfortable and was primarily cotton, but offered some support.  Little bralettes are fine for wearing around the house, but have no support. This bra provides some support (not like my normal bra) and fits the bill for traveling. I ordered a 36 and it fit perfectly. I am small around the rib cage and normally where a 36C or D.