Using this Klein hard hat replacement suspension is easy. First, make sure your hard hat is clean. Then, attach the suspension at the four points inside the hard hat shell. You can adjust the height using the multi - level height adjustment feature. Use the ratchet - knob to adjust the fit. You can do this with one hand, even while wearing work gloves. Position the ratchet adjustment on your neck using the suspension pivot for a secure and comfortable fit. Remember, the sweatband and top pad are sold separately, so if you want them, you'll need to buy them. For maintenance, clean the suspension regularly with a mild soap and water. Let it dry completely before putting it back in the hard hat. Store it in a cool, dry place when not in use. Don't expose it to extreme heat or chemicals as this may damage the nylon material.