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Your Undergarments Are Too Hot for Even You to Handle
Nylon and rayon fabrics can trap wetness against the skin and are less likely to allow it to evaporate. This is especially uncomfortable if the fabric sticks to areas of the body that are prone to sweat, like the feet, groin and under the breasts. On steamy days and nights, choose underwear and bras made from breathable cotton or, even better, wicking materials like CoolMax or Dri-FIT.
One more thing: Make sure the fit isn't so snug that it prevents evaporation.