Insulated pots

[wallsg7]

Hi,i have recently learned of the availability of polystyrene foam insulating pots.Apparently these can be benificial for growing cp's which are sat in the sun all day by keeping the roots at more acceptable temperatures for the plant.This makes perfect sense to me.Has anyone tried these pots out on their cp's yet?Also does anyone know of a uk supplier?
Thanks in advance

Gary