Gates - 2 Piece Hydraulic Hose Fittings

Double wire braid hydraulic hose construction: It is made of synthetic rubber lining of oil resistant, two wire braid reinforcement separated by synthetic rubber layer, and synthetic rubber cover that is oil, fuel, weather and abrasion resistant.

You have your outer cover, you have your reinforcement, which is a 1-wire in this case. You can see that it's crisscross braided pattern, very flexible. Then you have your tube or your inner carcass and most often it's nitrile, which is very resistant to oil, won't breakdown. This is what you call 2-wire hose.