It is really important that you use a batting cage net in your practice. This makes it safer, and therefore also more fun. Of course, you have to make sure that you get a good net, particularly when you consider how strong they have to be. The impact and speed of a baseball is pretty impressive, after all.
There are different thread counts or denier in batting cage nets. Generally speaking, either polyethylene or nylon is used. You can find cheaper materials, but these are generally of very low quality, meaning that your net won’t last as long. As such, it is clear case of false economy, as you will have to replace it more regularly.
The point of the cages is to trap a ball that you don’t manage to hit back. They save a lot of time and energy as well, as you would otherwise have to spend this going over the ground trying to retrieve balls. Consider the speed at which these fly, you could end up searching quite a large area and still come back empty handed. With the security of a net behind you, you can put all your attention on the ball, rather than having to think about where it will land if you miss.
Generally speaking, these nets are stationary. They attach to a cage and stay there until they need replacing. This means that they have to be made out of highly durable materials, as they are exposed to sunlight and other weather phenomena on a daily basis. UV rays are particularly bad, as they quickly weaken the twine. Of course, frost, rain and wind has an impact as well. This is why most nets have been treated with various chemical solutions to minimize the impact that the different elements have.