When we choose sports knee pads, we need to consider the scene we are exercising in, such as outdoor inline skating, or outdoor mountain bike. These two are different ways of exercising, and the knee pads we choose are also different.
In inline skating, roller skate, skateboard, we need to choose thickened lining and high-strength wear-resistant plastic shell, which will avoid high-strength impact and provide good protection for the human knees. As shown in the figure:

First point: the sports knee pads will consider very good plastic parts, usually made of three types of plastics: PC, ABS, and UHMW-HDPE. Their prices are also different, but there is no doubt that UHMW-HDPE is the most expensive.
Second point: EVA with the best cushioning power, usually composed of thickened EVA and seismic materials. But seismic materials are the most expensive, and D3O sold on the market is this material.
Third point: wear-resistant fabric, usually made of 600D and 900D thickened Oxford fabric. Because it is ordinary fabric, it can be made into different colors, which can effectively solve the MOQ problem.
If you want to open up the European market, it is recommended to submit a CE test. The market usually uses EN 14120:2003+A1:2007, which takes into account the three major points of penetration resistance, force distribution, and peak transmitted force on sports knee pads.
So when we choose sports knee pads, we need to consider the brand, style, scope of application, and size. It is recommended to have a certificate to protect our consumer rights.