How Is Foam Rated? Understanding Density and Hardness

Let's take the average foam. It's rated 24/130.

What the Numbers Mean

The first number (24) is the weight of the foam per cubic metre (kg/m³) and indicates the density of the foam, which affects durability.

The second number (130) is the amount of pressure in Newtons it takes to compress the foam to 40% of its size. This measurement is called Indentation Load Deflection (ILD), which assesses the firmness or "feel" of foam - how it yields to weight and pressure and how it returns to its original shape after compression.

Quality Levels

Now, we wouldn't use 24/130 foam in our cot mattresses. From 1990, we've been looking for better performance so they can be guaranteed for 5 years. This is all part of the future: making products that last rather than ending up in landfill.

Good-quality pocket sprung baby mattresses use 30/150 foam - this is a huge step up in durability, support, and comfort.

For the past 15 years, we've also produced pocket sprung mattresses made with 50/215 foam. Nobody else in the cot mattress industry uses such high-quality foam to encapsulate the springs.

Why Perimeter Edges Matter

When your toddler stands up against the cot side, their feet aren't on the springs but the side of the mattress. Obviously, they create more downforce to one area when standing, or holding on to the sides and jumping up and down in enjoyment - normally with a lovely smile!

The sides of the mattress need to be firm and supportive so their feet don't crush the foam and slip down between the side of the mattress and the firm side of the cot.

Memory Foam - A Warning

Memory foam is NOT for cot mattresses. It has too many extra chemicals, it can cause overheating and pooling, and it's really not worth any further discussion.