Narrow mesh / small apertures: The gaps are too small for fingers or toes to grip, making climbing almost impossible.
Tall height: Often ranges from 2 meters up to 4 meters or more for extra security.
Strong materials: Usually made of galvanized or coated steel wires for durability and resistance to cutting.
Smooth or spiked top: Some have a flat, smooth finish to stop gripping, while others include spikes or barbed wire for additional deterrence.
Visibility maintained: The mesh design allows clear sight through the fence, useful for surveillance and aesthetics.