Debenhams head of lingerie buying and design, Sharon Webb said: "Many women find the search for a bra that fits, flatters, is comfortable and functional, is as hard as finding the right man.
"Our research showed that many traditional t-shirt bras were quite heavy due to their dense foam structure, which is required to give an invisible fit."
Over 90% of women in wearer trials agreed that the bra felt like a second skin.
Back specialist Dr David W. Evans commented: "Since half of the population will at some point probably wear a bra, it is important they will help more than they hinder.
"A properly fitted, well-designed bra, made of light materials that do not restrict movement, is likely to help women stay active, which is the best way to recover from back pain."
The light as air t-shirt bra has no bulk, and moulds to the body, feeling noticeably lighter than any other bra.
Debenhams Sharon Webb continued: "This is an everyday t-shirt bra, designed to be seam-free under clothes. It has bonded straps and bagged out wings for a luxury finish and added comfort.
"It's a weight off our shoulders. We are confident that once women try this bra, they will never wear another t-shirt bra again - it really is unbelievably comfortable."
Always looking for ways to make women feel more comfortable and confident, the team at Debenhams developed the bra to give a barely-there feel, whilst the light weight foam cup gives a smooth and round shape.
The light as air bra weighs 48g while other popular bra styles such as the regular t-shirt bra weigh 58g, a push up bra weighs in at 92g and a gel push up bra weighs around 235g.