After each hike, give your insoles a thorough inspection. Look for any signs of wear and tear, such as holes or tears, and check that the adhesive is still holding them firmly in place. If you spot any damage, it’s time to replace your insoles. Even if your insoles are still in good condition, it’s a good idea to give them a wash after each hike.
This will help to remove any sweat or dirt that could potentially cause them to degrade. Just pop them out of your boots and wash them in warm, soapy water. Rinse them thoroughly and allow them to air dry completely before putting them back in your boots.