The Body Geometry SL Insoles Gen 2 replace a cycling shoe's stock footbed with support built around actual arch height. Three contour options, from low to high arch, address the alignment issues a flat footbed leaves unsolved, and the proprietary foam holds its shape ride after ride. What Our Gearhead(R) Experts Are Saying:"I sized up my own arch after a season of hot spots on long rides, and swapping to the matching contour cleared it in one ride. The pressure that used to build by mile 40 just isn't there anymore."