"I almost bought this bra just to understand what it was all about, and I am very happy I did! It is undwire, and and the underwire is only attached at the ends and on the bottom of the bra, and it sits directly against your boobs on the top side of the underwire. There isn't any lining or padding, so it is completely see through, but it looks really sexy. The lace is super soft and very stretchy, so its not overly supportive, but would be nice under an empire waist dress or something else fitted in the chest area. If nothing else it is pretty and sexy enough to wear around the house. I would say moderate support (135lbs, 36C for reference, and Med. was perfect)."