Some bra designs use convertible styles, adhesive bras, underwire and strapless bras. A bra without an underwire is a softcup bra. Strapless bras rely on an underwire and additional seaming and stiffening panels to support them. Underwire began to be used in bra construction. During the 1960s, designers and manufacturers introduced padded and underwire bras. Underwire bras, like other constrictive garments, may contribute to clogged milk ducts in lactating women. When the underwire breaks through the bra fabric, it can cause tremendous discomfort. The underwire of her bra deflected the bullet, preventing fatal injury. Horstman had previously worn an underwire bra into the facility without problems. The first underwire bra was developed in 1938. As of 2005, underwire bras were the fastest growing segment of the market. The underwire can be made of metal or molded plastic; most are metallic. The underwire is made of metal, plastic, or resin. Studios and have guest blogged for Wired Magazine's Underwire website. She has written a memoir "Notes From The Underwire".