iGel Apollo compared to Hybrid 3?

we're looking for a king-size mattress. When we looked round Benson's, we liked the iGel Apollo mattress. Looking on your web site, that seems to equate to the Hybrid 3 Coolblue medium (?). Our concern is you say that this would suit 12-16 stone individual. I am 13 stone, my wife around 8 stone. How would this suit us both?

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