Do superfeet (the yellow ones, I think) help pronation? my left foot is pronated
It would be better if someone who actually uses them would answer you. I tried them and found them insufficient for my particular needs.
They are heat moldable orthotics, which mold (to a limited extant) to fit the bottoms of your feet, but they are sold to the consumer market instead of through the medical community. (BTW, for about $300-$400 you can get a podiatrist, ATC, PT, etc. to help you heat mold them under their professional guidance.) You get them hot enough to mold, put them in the boot, and put your feet on top of them. So if you put all your weight on them, they would deform to fit the shape of your feet, and provide very little of the support you need. But if molded with less than full weight, or with someone helping you keep the right foot/ankle/leg/knee/hip alignment, they should provide most of the desired support.
You need ones that are sized so that they can be cut down to a size that presses hard enough against the sides of the boot that they don't rock and shift inside the boot. (If you have relatively narrow feet, you may do better with the Superfeet model that is designed for skates rather than for hiking boots.)
Such rocking and shifting motion leads to a partial loss of control of what the skate is doing on the ice, which means you won't be rated as high by figure skating judges. Unfortunately, if sized or cut down to press hard against the sides of the boot so that they don't rock and shift, they gradually stretch the boot until it no longer fits, at which time your feet will rock and slide, and the boot will also then break down more quickly.
You can achieve almost exactly the same types of support by sticking thin strips of athletic tape (also called coach tape, and sold in both sports and medical supply stores) under the insole where you need support (mostly, under the "medial longitudinal arch", which is under your feet near the inside edges of your boot). In fact, tape is more customizable than a moldable orthotic, and is far cheaper.
Superfeet and most heat moldable orthotics only mold in a two dimensional warping sense. They don't get thicker and thinner where needed to mold in a true three dimensional sense, which is what you could do with tape. That's why they rock and shift if not cut right.
But many people are very satisfied with Superfeet, including some people on this board.