I learn to do "skin" on the basis of the same polyethylene foam and swift her sculptural objects of any shape. It sits securely, forming a monolith with the main array. It has been possible to provide a different kind of "spot", as well as Khoi-kind texture for a natural skin ..
All foamed inside ... the material is more rigid than foam rubber, in my opinion due to this, it is easier to withstand the necessary forms when covering