The downfall of the wicked does not happen by chance. It is a direct result of their own actions and choices, which steadily guide their feet into a trap. According to [אבן עזרא], a person's own feet actively lead him into the net. This means that the wicked are guided toward disaster by their own counsel and free will [מצודת דוד]. There is a bitter irony in this process, as the very plans they believe will save them, and the paths they rush down to find shelter, transform into the snare itself [רמב״ן]. Offering a more physical description, [מלבי״ם] explains that the individual is already caught. His feet are stuck in a sharp, piercing net that surrounds the central trap.
The primary approach among commentators is that this trap is a complex, woven net, crafted much like a turban or a hairnet [רש״י, רלב״ג, מצודת ציון, אבן עזרא]. Another perspective views it as a thicket of branches carefully laid over a pit to hide the danger below [ביאור שטיינזלץ]. Regardless of its exact form, the situation is continuous. The person willingly and constantly walks upon this hidden danger [מצודת דוד, רמב״ן]. Building on his earlier point, [מלבי״ם] notes that because the outer net is already attached to the person's feet, he drags it with him everywhere he goes, eventually pulling himself directly into the main pit.
Applying this concept directly to Job's personal tragedy, [אלשיך] suggests the net represents the continuous sin of his sons' extravagant feasts. God delayed their punishment, hoping they would change their ways. However, instead of removing the danger by stopping the celebrations, Job merely walked upon the hidden trap. He satisfied himself with external corrections, such as offering sacrifices after the parties concluded, while allowing the trap itself, which was the root of the sin, to remain completely untouched.