These soft gel palm rests are lifted up to allow for a neutral wrist angle when using our Dactyl keyboards.  If you don't like to float your hands when you type, these are a must!
 
Important - place the rests under the heel of your hand or palm (as shown) rather than on your actual wrist.  Placing palm rests (often misleadingly named "wrist rests") under your wrists has the potential to add strain rather than helping!