Thanks Liza for giving me another option for my burning feet. I had never heard of these inserts before so I just did a google on them. I went to road shoes/pedals as I was told it would reduce my burning sensation to my left foot-bigger area of pedal dispersement vs. smaller spd dispersment. Had the specialized inserts which initially helped in my mtb. shoes, is not helping in my Sidi's at all-even bought new ones in case the old ones were worn. Doesn't matter if my sock is thick, thin, or if my shoe is tight or loose..actually, it just occurs later in the ride if I wear thicker socks and my shoes are looser.