When traveling to a climate that is snowy, and you are going to snow ski, bring clothes that you are able to layer. When the sun comes out in the day time, and you are dressed in several layers, you can start to take off layers once you really start sweating while you are skiing. If you have asthma, or breathing difficulties, make sure you have supplies that will help in this area if you become short of breath. Copper Mountain is 13,000 feet above sea level, very hard to breath. Warm boots, skiing gloves that are thermial, snow pants and a snow coat.