As with a lot of the other buying considerations, this right here is going to be based on you and your needs. From one user to the next, the required thickness needed is going to be different. And, it all comes down to the fit of your footwear and your feet, in general. If you have low-volume feet then you will probably want to opt for a thicker product. Then again, if the shoes you have been designed with ample padding and already limit your room then you may want to opt for thinner ones. Truth be told, it is better to try on the garment with your shoes but this is not possible online. So, extra research becomes that much more important.