The results show the relative importance of factors, from most significant to least significant: foam material, metallostatic head, the permeability of the coating, pouring temperature.
Based on the experimental results, the diversities of the velours thermal conduction and ventilating in different directions and the mechanism which influence on its diversity are discussed.
It's also great at holding air, and so, with plants that are really, really sensitive to anaerobic conditions, or don't like to stay too wet, it can be a really great medium for those plants.