Just ordered a pair.

Quoted: 1) Rear-Foot Control Point Only Superfeet synergizer insoles provides this feature to control over-pronation, thus helping keep your foot correctly aligned. The Result: Is less stress on muscles and joints. 2) Mid-Foot Control Point Another Superfeet Insole original. This area stabilizes the mid-foot. Combined with Rear-Foot Control Point, this enables you to use your skeletal strength to your advantage. Result: a very stable foot, creating less muscle fatigue and more endurance.

Quoted: All Superfeet products are primarily designed for feet that over-pronate. If you feel like the arch is too far back, the product is actually telling you that it's trying to support you rear foot (heel bone) so the foot doesn't have the ability to collapse.

From http://ask.metafilter.com/43186/Suggestions-for-overthecounter-orthotics

Quoted: I tend to also pronate when I walk. My orthopedist said "I can give you a prescription for an orthotic or you can get Superfeet." He had taken a close look at them and approved. Much cheaper than a prescription.

Looking for orthotics for my hiking boots. My sneakers (Pearl Izumi) already provide good support

Quoted: Fortunately, she made it out, and once back home Anne headed straight to her doctor, who told her, "Your knees hurt because your feet are flat." She knew she had flat feet because the genetically caused condition runs in her family, but she never suspected it could leave her crippled in the backcountry. Assuming corrective knee surgery or a brace was in order, Anne was surprised when the prescription called for custom orthotics for her hiking boots.
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Pain can also figure into the picture because most flat feet over-pronate, or roll too much to the inside, a condition that affects about 80 percent of the bipedal population.