Which of the following is a crucial aspect of maintaining synthetic slings?

Inspecting synthetic slings before every use is essential because it ensures that the slings are in good working condition and free from any damage that could compromise their strength and safety. This involves checking for signs of wear, fraying, cuts, or other defects that could lead to failure during lifting operations. Regular inspections help to identify any issues early, reducing the risk of accidents and ensuring the safety of personnel and equipment.

While other aspects like washing regularly, storing in a dry place, and labeling properly are also important for the overall care and usability of synthetic slings, the most critical action is the inspection. This is because even a small defect can lead to catastrophic failure in a lifting scenario, making it imperative to check the slings thoroughly before each use.