The term ‘spacer bra’ describes smooth T-shirt bras that are constructed from a dual layer foam fabric rather than a single layered dense padded cup. They feel light and airy, and best of all, they breathe.
Unlike most traditional T-shirt bras which are hot and trap moisture, spacer bras are so cool that you never really perspire in them. The fabric is almost like a honeycomb, and if you hold the cup up to a light, you can practically see right through it. Thankfully, the lightness does not equate to a loss in support.