Oregon Aero&reg; BLU&reg; Kit (Ballistic Liner Upgrade) for the MICH, ACH, LWH, RBR and other Helmets Seven, 3/4" pad helmet liner minimizes helmet movement and holds helmet comfortably in place providing pain-free protection no matter how long its worn. Multiple-layer pad construction provides superior shock-absorption in case of blast. Compatible with mask, night vision goggles, shooting position. Keeps steady, comfortable temperature. Replacement, Upgrade or OEM equipment. Cooler, drier, breathable; gas and air permeable. Constructed out of the highest quality foam and fabric materials, the Oregon Aero BLU Kit provides maximum comfort and stability. Fire-resistant foam; pads wont melt or burn. Self-wicking fabric covering keeps head cool in warm climates and warm in cold climates. Routes perspiration and heat away, reduces sweat. Wont cause skin irritation or itchiness. Moisture and waterproof yet breathable coating keeps water and sweat out, air in. Advanced coating enables helmet to float in water-fording or amphibious condition (positively buoyant). Performance of pads not compromised when wet, waterproof tested to 66 for 12 hours. Easy installation, upgrade helmet in minutes; no helmet shell modifications required. Hook/loop fabric sticks to hook/loop strips inside helmet. Easy cleaning, wash by hand with soap and water; air dry.