Unisex, Light weight (~560kg) with ventilation. Size medium (fits head circumference of 55-59cm or 21.6-23.2 inches (See size guide in photos). The K2 Phase Pro helmet features a Baseline Audio System W/ built-in speakers. However, it’s important to note that it uses a wired connection (aux cable) rather than Bluetooth. You’ll need a 3.5mm headphone jack adapter that’s either a USB type C or Lightning cable to plug your device in. Perfect for winter sports. Has never been involved in a fall/crash. Fits all goggle brands. See details in photos or ask questions if needed. Comes with storage bag and cable with pause, volume controls.