I needed to buy some insoles after I started getting some foot pain in my barefoot shoes - especially when walking on the footpath/on concrete. These are well cushioned and nice and wide. I fit them into my non-Freet shoes (Drifter Leather handmade boots). I got a size 40 and 41 (as 2 x size 40 wasn't available) and just cut the size 41 to fit my size 40 (ish) boots. The size 40 fit perfectly. I don't really understand about high/low profile feet, but you definitely need to have a fair bit of room in your shoes to fit 6mm of cushioning I did, but I guess not everyone will. If that's the case just get a 3mm one. Overall I'm pleased I got these and would buy again. In fact I'll probably wear them with all of my barefoot shoes.
Freet - 6mm Insole