Tim if you look at the link that was posted you will see that it's not an engraving laminate but a solid PVC material so it is soft but it won't be foamy
as it won't contain the air that materials such as Foamex do.
Took this from the website:Tool manufactures, such as Onsrud and Vortex, classify our material as ‘soft plastic’ in their catalogs and information. This is important because the geometry of the bit changes given the material it is intended to cut
So it is a soft material compared to an engraving laminate such as Rowmark or Traffalyte, I have no idea who sells either the King brand or an alternative in the UK but will ask on another forum I use