There are two types of knee pads that people typically use: foam and gel. Each type has its own benefits and drawbacks, so it’s important to choose the right one for your needs.
Foam knee pads are usually cheaper than gel pads, and they’re also more comfortable to wear for extended periods of time. However, they don’t provide as much protection as gel pads do.
Gel knee pads are more expensive than foam pads, but they offer better protection against impact and abrasion. They can also be uncomfortable to wear for long periods of time, though, so they might not be the best choice if you need to wear them all day.