Wrist braces generally consist of some flexible material with metal splints embeded in them. When you strap them on, the prevent you from bending your wrist up or down to a great degree.

The theory is that making repetitive movements with your fingers while your wrist is flexed wears down the tendons, leading to pain and inflamation in them (tendonitis), and eventually to constriction of the nerves running through the wrist (carpal tunnel) by the inflamation. This is extremely unpleasant, and I am very grateful for my wrist braces.

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