I've never done heat-mold ones. I used to use the Specialized green insoles, but they didn't work. Then I a) switched shoes (Specialized to Mavic, though I still use the Specs with my CX bike), and b)switched insoles to a set from Pearl Izumi that came with multiple shim things so you can independently "tune" arch support and whatever-it's-called under the toes. It took a little tweaking, and I really should take sandpaper to the left one to bring it down a bit, but it's pretty close.