A secure Weight Belt or Weight Harness is a crucial safety item for any diver. It has to be able to be released instantly in any emergency, allowing you to drop your weights. But it also must but be locked enough not to come loose during your normal diving activities.
For scuba diving we like pocketed weight belt solutions like the Apollo Comfo Pocket Weight Belt, They are typically in combination with a BCD integrated weight system.
For freediving and spearfishing, plus scuba diving, the combination of webbing or rubber Weight Belts and Slotted Weights is typically used. Here's a video from Cressi about setting them up correctly.
Many apnea divers also use a weight vest to transfer some of their diving weight onto their back for an improved transition and better weight distribution.
Get your buoyancy right with these Weightbelt, Weight Harness and Weight Vest options from The Scuba Doctor.