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ProFoot Miracle insoles. Best I've found at any price, and cost only $8-$10.
Thin, lightweight, resilient, perfect for my needs. They fit in my snug fitting Scott Road Pro shoes without cramping the narrow, low toe box. And with my roomier Fizik Tempo shoes with larger toe box, the insoles leave enough room for thicker winter socks.
I've had foot problems since I was a kid -- high arches, very narrow feet, little padding on the soles. I'd get arch cramps, hotspots on the metatarsals, the works. Custom orthotics weren't as good as the ProFoot Miracle.
My little toes tend to lose circulation and get numb even in warm weather if there's too much pressure on the top of the foot. The Miracle insole is so thin it doesn't cause that problem. With other insoles, like Dr. Scholl's, I usually need 3/4 length insoles that don't extend the full length of the toe box.