a band lining the inside of a hat or cap to protect it against sweat from the head.
a band of fabric worn around the head to absorb sweat.

1890–95; sweat + band2

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World English Dictionary
sweatband (ˈswɛtˌbænd)
1.  a band of material set in a hat or cap to protect it from sweat
2.  a piece of cloth tied around the forehead to keep sweat out of the eyes or around the wrist to keep the hands dry, as in sports

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
To determine your exact cap size, use a tape measure around your head where the
  sweatband rests.
The internal cradle of the headband and sweatband forms the suspension.
She'll wear a sweatband and those cool little canvas knee pads to play
After several tests it was discovered that the sweatband of the cap he wore
  regularly had become contaminated with pesticide.
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