Twisted Knotted Baseball Backstop Net Material

Usually, twisted knotted baseball backstop nets are made from HDPE and nylon.

Here is the difference between two materials:

Lower break strength than nylon
Good for as barrier net with little to no impact
Does not absorb water
Less expensive

Nylon black nets could be coated with tar so it is UV and Weather Treated to last outdoors.
Nylon has higher break strength, and it is more resistant to impact than Polyethylene
Nylon has excellent resistance to abrasion, and outstanding overall durability.

Twisted nylon netting is one of the most common and versatile types of netting used. It is very strong, easy to work with, easy to repair, and is resistant to most chemicals and water.