At Ultimate Sport Gyms our products use urethane treated Nylon and High Density Polyethylene (HDPE). Both types include UV inhibitors adding to the life of the net. With the Nylon net the netting has an external coating to protect it from the UV rays. This coating will wear off in time. Where the HDPE nets have the protection incorporated internally into the twine fibers giving it a permanent protection the will not wear off. HDPE is lightweight, does not absorb water, and resists breakdown in direct sunlight. Both the Nylon and the HDPE fibers are twisted or braided into twine. HDPE nets do not absorb water as nylon can, therefore resists rotting better than nylon or other materials.
High Density Polyethylene (HDPE)
HDPE netting is inexpensive and does not deteriorate as quickly due to moisture. As the netting is exposed to moisture, (HDPE) retains a higher percentage of its strength than nylon. HDPE does not absorb water, so the problem of rotting and shrinkage disappears. HDPE nets are less expensive than Nylon, and although HDPE nets do not have the initial break strength of Nylon, the HDPE net will last longer in an outdoor application. For outdoor use the performance is nearly on par with nylon. These cages may provide the best value for those concerned with both quality and price.
Nylon
If you have an indoor cage, and durability and break strength is more important than budget, nylon netting is right for you. Nylon has the strongest break strength, and is by far the most durable netting for indoor use. Nylon has  excellent resistance to abrasion, and outstanding overall durability. However, nylon is expensive. Because nylon netting can absorb water, many manufacturers treat the nylon with some sort of bonding agent by either dipping or spraying the twine. Although treating nylon with a bonding agent will dramatically reduce nylon’s tendency to soak up water, it doesn’t stop it entirely. Eventually, nylon will likely shrink and rot.
When compared with HDPE netting, nylon is initially stronger than HDPE, but deteriorates faster. Nylon loses between 15% and 20% of its strength each year depending on conditions. For year one, a #36 nylon will have a greater break strength than a #36 HDPE, but depending upon weather conditions, by the end of the third year HDPE may be as strong, and KVX200 may be stronger.
Although nylon netting has a high initial break strength, if left outside that strength can deteriorate rapidly. Nylon absorbs water and loses strength in direct sunlight. For indoor applications, nylon is an excellent choice. If your netting will be exposed to adverse weather, consider HDPE.