Do you know Simba mattress

Hi,
A friend of mine bought a latex mattress from you a while ago and loves it so he recommended me to you guys as I was going to buy a Simba mattress, but now I'm not so sure.
What put me off is the fact they market their hybrid construction using springs and foam but then I found out that they put the mattress in a very small box - surely thes springs can't be very good if they can be crushed into a small box.
Can you offer any advice? I saw this article on your website, is this what Simba uses? https://johnryanbydesign.co.uk/understanding-beds/cage-sprung-open-coil-continuous-coil-mattresses/