wristband

Short definition from Wiktionary

Noun

1. 1
   The cuff of a sleeve that wraps around the wrist.
2. 2
   A strip of material worn around the wrist, e.g. to absorb perspiration, especially in sports.
3. 3
   A decorative band or bracelet that encircles the wearer's wrist.
4. 4
   A band that supports a wristwatch.
5. 5
   A cord worn around the wrist, used to hold a small object such as a knife: a lanyard