Hi Mr Howes

Thanks for your question.

I am afraid i have no idea what type of gradings for foam and latex mattresses were being used 20 years ago, i can tell you now, that latex of 70 kg density will give a medium feel to body weights of 8 st to 14 st.

An 80 kg latex density will give a firm feel to body weights of 13 st to 16 st.

We have our Fusion range of mattresses that are made from 100% natural latex. Latex mattresses can be great for people who have back or joint pain, the way latex moulds to your bodyshape, can help to take the pressure away from aching joints.

If you require any further assistance please call the office.

Kind Regards Gary