When you sleep on a mattress, your body puts weight on it. The performance of a mattress when someone is on it is called its "carry that weight". Imagine you are carrying a heavy backpack on your back. You want the backpack to be comfortable and not hurt your back. Just like that, you want a mattress to be comfortable when you lie on it and not cause any pain or discomfort.
A good mattress should evenly distribute the weight of your body, so you don't feel any pressure points. Pressure points are the spots where your body is pressing harder on the mattress, such as your hips, shoulders or knees. If your mattress doesn't evenly distribute your weight, you may wake up feeling sore or achy.
Another important factor of mattress performance is its ability to support your spine. A good mattress should keep your spine in a neutral position, which means it should be in a natural alignment. This helps to reduce any discomfort or pain in your back, neck, or shoulders.
Lastly, the materials used in a mattress play a big role in its performance. Mattresses can be made of different types of foam, springs, and other materials. Each material has different properties that affect how the mattress carries your weight. For example, some people prefer memory foam which contours to the shape of their body, while others prefer spring mattresses which have more bounce.
In summary, mattress performance or "carry that weight" is how well a mattress supports and distributes the weight of your body while you sleep. A good mattress should evenly distribute your weight, support your spine, and provide a comfortable sleeping surface.