Using these leather wrist restraints is easy. First, place the restraint around the wrist. Make sure it's not too tight or too loose. Then, use the L - 300 lock buckle to secure it. Only authorized personnel should use the K - 300 key to open the lock. When using, always check the fit regularly to ensure the person's comfort. For extra comfort, you can add the optional foam padding or use the disposable fleece liners. After use, clean the restraints with a mild soap and water. Let them dry completely before storing. Keep them in a cool, dry place to maintain their quality.