If you haven’t purchased a mattress in a while shopping for one can be a daunting task. Since most people only buy a bed every 10 years you may have forgotten all about mattresses from one shopping experience to another. Then when you go to shop you take it upon yourself to cram as much information into your head as possible, and only then you head out into the world of bedding. When buying a mattress you will encounter some basic coil terminology no matter where you shop, so this can help you compare apples to apples.
There are many different coil types out there. I am only going to talk about the four most common, because all others are some sort of variation of these. I do want to give you a word of caution about coils, DON’T get too caught up into coils. If you read too much into coils you will end up with something you may not like just because some person said the more coils the better. If you choose to get caught up in coil count keep in mind that on a full size you only need 312 coils with a 13 gauge wire and 6 gauge border rod to be considered “orthopedic”. So as you can see more is not always better, because most beds have way more than 312 coils.
Individually Pocketed Coils
Each coil is in what looks like a sock. This allows all the coils to work independently, and therefore reducing partner disturbance. In other words if someone tosses and turns the other person won’t be woken up. These types of coil units provide some of the best support out there.
This is the oldest type of bed coil. It provides basic support in a mattress. The coils in this type of setup are shaped like an hourglass.
These coils are specially formed with the top and bottom flattened or “offset”. This allows them to be connected to adjacent coils by a helical wire. This type of coil unit provides upgraded support from a Bonnell type system
Each row of coils is made out of a single piece of wire which twists and turns its way from the head of the bed to the foot. This helps eliminate motion transfer to a sleep partner.