The cup size is certainly not in any way different from the rest of the size, but meant for someone who has almost no breasts at all. Disproportionate teddy, no use.
HerSecret.fi response to the estimate:
Thank you very much for your feedback! It's a shame to hear that teddy didn't sit well with you. Do you know that a resellable or unused teddy (teddy can be fitted over your own underwear) has a free exchange for any other product in our range? :) Exchange is easy through our customer service! The resellable teddy also has a standard 14-day right of return.