What is the most important functional feature of a weight belt or weight system?

The most important functional feature of a weight belt or weight system is the ability to ditch weights immediately. This feature is critical for diver safety. In an emergency situation, a diver may need to eliminate excess weight quickly to achieve buoyancy and ascend rapidly to the surface. A weight system that allows for quick release ensures that the diver can respond to sudden changes in buoyancy or emergencies, such as equipment failure or a medical issue.

Quickly ditching weights can mean the difference between safety and a potential risk of drowning. While comfort, adjustability, durability, and proper weight distribution are significant aspects of weight systems and contribute to overall diving comfort and efficiency, they are secondary to the fundamental safety feature of being able to release the weights without delay when necessary.