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If you have a Koala mattress and find the medium-firm option too firm, reach out to their support team via chat and mention you're considering returning the mattress for this reason. They’ll often offer a free mattress topper to resolve the issue!
Not sure how much this is worth but its delivered from Sydney in a large box and usually toppers are a couple of hundred at least.
I find it too soft, either its medium or firm… No difference for me, its pretty soft