The Pop Out Rail Adapter Kit works directly with our M-LOK helmet rails. Precision machined from aerospace grade aluminum they are rugged and robust. The pop out feature allows the user to "pop" the headset off the ears for venting and donning. They allow the user to seamlessly integrate hearing protection headsets or communications systems (headset guide) directly onto helmet rails. This eliminates the need for an uncomfortable strap underneath the helmet that eventually creates hotspots and headaches.