Elila Simplex Tricot Longline Strapless Corset 6421. This longline bra is a more supportive alternative to a regular strapless bra. Simplex fabric combined with one-way stretch back elastic, spiral and metal boning create a comfortable yet supportive garment that can be worn all day and night. Key Features include: Simplex fabric molds to the body. Cups have a natural rounded shape while still giving maximum support. Bottom band is covered to give more control and a cleaner appearance.