Communication while skiing is very important. Cell phones will limited by the signal on the slopes or backcountry. Pick up the two way radios will help you keep in touch with your fellow skiers or the resort.
Be safe on your adventurous ski trip! Out on the slopes, you can't always trust cell phones to pick up a signal and keep you in contact with your fellow skiers or the lodge, but given the extreme winter conditions you often face while out skiing, you can't afford the possibility that you won't be able to call for help or find your party because of spotty phone communications.