Bra allows the wearer to use the tighter hooks as the bra stretches during its lifetime. Bras may be designed to enhance a woman's breast size, or to create cleavage, or for other aesthetic, fashion or more practical considerations. Nursing bras are designed to aid breast-feeding. Compression bras, such as sports bras, push against and minimize breast movement, whereas encapsulation bras have cups for support. Breast support may be built into some swimsuits, camisoles and dresses. Bras come in a variety of styles, including backless, balconette, convertible, shelf, full cup, demi-cup, minimizing, padded, plunge, posture, push-up, racerback, sheer, strapless, T-shirt, underwire,
Shelf ice higher than the rest of the shelf. If there is more than one sand bar along a beach front, the ice shelf will form a ridge along each sand bar. Because of the uneven surface and possible air holes throughout shelf ice, the ice may give way unexpectedly. One can plummet several feet through an air pocket into open water. Self rescue is difficult due to the friability of the ice and the rate at which the cold water will sap energy. Traveling in a group with the correct ice self-rescue tools lessens the danger. Shelf ice Shelf ice is