Fit, shell material and style matter more than colour. Here is a short checklist before you order.
Start with the job. A basic shell suits general site work, while a vented shell suits hot days and long shifts. A chin strap is worth adding when the team works at height, bends often, or faces wind.
Check the fit before you order in bulk. Ask for a sample, try it with the suspension adjusted, and make sure it sits level and stays put when the wearer moves. A helmet that slides forward will not be worn.
Confirm colours, quantities and test reports at inquiry. Tell the supplier the team size and the work, and ask which report the supplying factory provides for the style you choose.