So Im a Logitech M570 trackball user, which means that my wrist stays in one position a lot.
I've gone through a lot of different wrist-rests and I've finally found one that feels amazing and isn't just stuffed with spongy styrofoam material.
Its gel-filled so it keeps its form after long-term use, and has a smooth outer soft, flexible outer plastic covering that doesn't feel scratchy on your skin like those cloth covered ones.
https://goo.gl/zbBfsZsuper comfortable, and feels like boobs.