We had previously upgraded front cabin with visco-elastic (Tempur-like) add-on mattress, but still needed some more depth in the softness. This weekend I installed Froli travel spring system that is adaptable to the odd shapes and locker covers and can also be customized in terms of firmness during installation. Based on first night experience, there is significant improvement in comfort and an additional benefit is that the springs create a ventilation gap below the cushions. Froli springs can be sourced from SVB, I ended up using 1 basic pack, 2 extension sets and 1 ½-element extension set.
Sleep tight,
Tommi
s/y Anniina