Personal protective equipment sits at the bottom of the hierarchy of control because it only protects the person wearing it, and only when it is worn correctly. Even so, for many tasks it is essential.
Start with the risk assessment: identify the hazard — impact, chemicals, noise, dust, heat — and choose equipment rated for it. Check the relevant standard marking on the product.
Fit matters. Respirators need fit testing, gloves and footwear should come in a range of sizes, and PPE should be compatible when worn together, such as safety glasses with hearing protection.
Finally, train people in how to wear, inspect, store and replace their PPE, and make sure supervisors lead by example.