That’s something I struggle with. Cannot too hard. Cannot too soft. Guess the only way is to go down to the showroom to try.
Problem is the hardest seahorse is not hard at all...hence sometimes can give me bbfa back pain. I bot it bcos they can custom make the mattress to any size i want. I have a bed frame slightly bigger than super single, it's very hard to find the right mattress size for it. No choice lan lan have to live with the seahorse.
Try out the king koil at the shop if u like firm mattress. My mom using it and it's really comfortable. Four star is another contender if u look for budget firm mattress, but i still think can top up a bit and get the king koil, more bang for your bucks.