When it comes to getting the lightest and strongest helmet possible, carbon fiber is the material of choice for top manufacturers. Offering unmatched rigidity and strength over materials such as polycarbonate plastics and fiberglass, carbon fiber reinforced polymer delivers a strength to weight ration that far surpasses many similar products. When used in motorcycle helmets, it offers both a lighter weight shell for better performance and reduced fatigue, as well as increased crash protection and shock absorption (not to mention a look that just cannot be beat!). If you’re unwilling to settle for the status quo and are looking for the latest in protection tech, a carbon fiber helmet may be the right choice.
Armstrong acknowledged Aldrin's completion of the post landing checklist with "Engine arm is off", before responding to Duke with the words, "Houston, Tranquility Base here. The Eagle has landed." Armstrong's unrehearsed  change of call sign from "Eagle" to "Tranquility Base" emphasized to listeners that landing was complete and successful. Duke mispronounced his reply as he expressed the relief at Mission Control: "Roger, Twan— Tranquility, we copy you on the ground. You got a bunch of guys about to turn blue. We're breathing again. Thanks a lot."