When it comes to Sports Bras, there are three important qualities when looking specifically at the material construction. Those are that it is firm yet flexible, is breathable and last but most certainly not least, that it has moisture-wicking properties.
Moisture-wicking materials draw moisture from the skin to the surface of the fabric. This is a more effective way of evaporating sweat as it is easier for the moisture to vaporise from the outside of the fabric, than it is when it is caught between the skin and the bra.
I took the liberty of photographing a bra I recently trialled on a short distance (6km) run in moderate temperature conditions. In the first image you can see that the moisture is sitting on the outside surface of the bra, which is made up of a moisture-wicking material.
In the second image you will note that there is a significant amount of sweat also sitting on the inside of the bra, which is a cotton material. The real shame with this product is that they have gone to the effort of using moisture wicking materials for the external construction, but the cotton layer that sits against the skin prevents this from being able to do its best work. I left the bra for 30 minutes post work out, and there was no significant change in moisture distribution. The sweat was still sitting in the cotton lining.
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