Some 3 part cup bras are made of microfiber, which has extremely fine filaments – even finer than silk. Because microfiber filaments are packed so closely, they can prevent moisture from passing though yet this type of fabric is breathable. Usually a blend of polyester or nylon fibers, microfiber fabric is known for being very light, smooth, soft and durable. Microfiber 3 part cup bras are lightweight, and they look and feel luxurious. They look great under knits and t-shirts due to the smoothness of the microfiber fabric yet they provide all the support of a 3 part cup bra. Check out the 3 part cup microfiber bras at HerRoom.com and enjoy free shipping.