Okay. I found it. It's in the manual. They admit that with 'sugar snow' the construction is difficult at best but 'can be done'...not super encouraging IMO.

There is also a blurb in the beginning about testing the snow by squeezing it between your hands. I wonder how they determine that heat from your hands isn't what's causing the snow to bind.

I believe their theory is that the pressure from the packing of the snow melts the particles slightly enough for them to bond. It's a sound theory...that's how ice skates work after all. But when it's really cold and really dry and the snow just right, I'm not sure I'd trust my life to this gizmo.

Definately could be fun if you had kids around. Assuming you could keep them distracted for 3 hours while you build the Igloo