Hi there Peter,
The Sleeptek Flex Lift looks good...latex, but expensive.
I wasn't able to find that particular Kingsdown mattress, but the company has a horrible reputation.
Latex has been thee best upholstery material for the past 100 years...most resilient and most comfortable...able to hold heavy weight over a long term.
Memory foam, on the other hand, has proven itself to be thee worst upholstery material ever invented...over its 20 year history.
We do carry a natural latex mattress from a Canadian company...Natura.
Here is a link to the line...with the "Bourdolay Plush" being the most popular.
Factory Direct to You....
All Items Made Factory Fresh to Fill Your Order
Free Delivery Nationwide....NO SALES TAX.