We will go ahead and get the most common question out of the way, which is, "I have a bike helmet/skating helmet can I use that?" No, do not use your bike or skating helmet for skiing. There is a very distinct difference in how helmets are designed for specific sports. Helmets for snow sports are designed to protect against the types of crashes typically experienced while skiing or snowboarding. All snow helmets sold in the United States must pass ASTM certifications to be legally called a ski or snowboard helmet. ASTM Certified helmets are designed to take a single serious impact and then they should be disposed of. In the event of an extremely serious crash the shell of the helmet might crack or break. When the shell of the helmet breaks most of the impact of the crash is directed into the helmet instead of your brain.
The safest helmet in the world is useless if its not being worn. In a push to get skiers to routinely wear helmets, manufacturers have developed many different shell styles to accommodate variances from rider to rider. Styles range from traditional full shell helmets to short shell helmets. Features may include audio capabilities, venting systems, visors, and even multi-density shells. Yet all of these features should not take the focus off of the major role of proper fit for a helmet. When it boils down to it, a helmet with audio capabilities is not going to protect you if it does not fit properly.