I have a king size Sealy that's 10 years old and in great shape still. ....it's a firm or a very firm but think it's a firm and it doesn'thave a pillow top. Over the last few years I been having back and neck problems. I have herniated discs in neck and back. Ibought this mattress when the belief was the firmer the better and have since reliazed this isn't always so.

 I'm 5 ft 7 and weigh about 145 lbs

I want to add a latex topper to keep the spine in line hopefully it helps with the pain.

The thing is I don't know what type of coils or the gauge of this Sealy mattress I have which would help me with choosing what type of

ILD latex to get.. This will help me in making my final decision. I know I want 3 different layers at 1 inch each so I can swap them around. EventuallyI want to build it up to about 10 inches ( I only have funds for 3 inches now ) and use my box spring as the platform.

I need some relief now and can't wait till I have the extra funds for all of it now so 3 inches (layers) will have to do for now.So does anyone know what type of coils / gauge this 10 year old Sealy might have ?

Thanks so much :)