oh great, thanks for you quick reply.

hm Sympatex is a german fabric, which is transparent for water vapor. A membrane gets laminated onto the fabric (for shoes or clothes). My Sympatex fabric is similar to supplex.
All of my mentioned fabrics are not waterproofed. Your right,itsīmore comfortable to sleep not in your own sweat *smile*
So in a double layer its better for diagonal sleeping when the pad is in between? But Iīm not sure if those fabrics do stretch...