ZL Labs take pride in making an insole based on precision and support to ensure the best fit and the highest levels of comfort. Meet Z-Liner Insoles: The Ultimate Upgrade for Your Feet. With uniquely formulated ZL™ Hexcore, these insoles are designed to cradle and form to your feet, without the foundation being compromised. Z-Liner also helps your feet to stay cool, dry, and odor-free, thanks to its breathable mesh fabric and honeycomb design. This allows moisture to dissipate while circulating constant airflow. No sweat, no smell. Also, the added arch support and adaptive heel-cup are precisely designed to help increase balance and stability while reducing common pains in your lower extremities.