Sip=Structural Insulated Panels
To me any insulated panel that is structural regardless of material would be a SIP.
There is a company in western Canada that sells a product that I think is from Germany. It is a panel filled with wood that has long fibres and looks a bit like a rough wool.
I have a friend that is building a 2x4 wall outside his frame and spray foaming the cavities of that with a soy based spray foam.
