What is the difference between a shelf bra and a built in bra?

What is the difference between a shelf bra and a built in bra?

Shelf bras and built in bras are bras that are sewn into tops, dresses, or loungewear to offer support without the need for a separate bra. A shelf bra offers light support with an extra layer of fabric and an elastic band under the bust, while a built in bra for women typically includes structured cups or padding for added shape and coverage. Both provide convenience as you don’t need to wear a separate bra, but built in bras offer more support for everyday wear.