5.11's FOUR LAYER BOOT INSOLES ARE DESIGNED TO GIVE YOU ULTIMATE SUPPORT WHILE ALSO COMBATTING ODOR AND BACTERIA. FEATURES: Layer 1: moisture wicking with anti-bacterial, Layer 2: odor control carbon fiber, Layer 3: foam padding, Layer 4: dual density Polyou® rubber forefoot (softer) and heel (harder) pads for maximum support.