In our mountainous regions there is good snow-shoeing and skiing at elevations of from 200 to 3000 feet from December to April. The climate here is commonly mild with days of continual melting--a temperature of 20 degrees or below being a rarity. The mountain snows are deep, forcing our summer cruising methods to a matter of reminiscence, and this depth increases very quickly as altitude is gained. At 5000 feet elevation the Frost King’s mantle may be found to be 20 or 30 feet deep but at this altitude few cabins for camp use can be depended upon. Special cold weather clothing requirements are imperative for keeping warm in camp and on the trail. Body warmth depends on several things. First, the body’s ability to make heat, hence our attention to heat forming foods. That this heat may reach all parts of the body and especially the extremities which are so susceptible to cold, the circulation of blood must be absolutely unimpeded by such things as tight shoes, constricting waist bands or tight clothing anywhere. Secondly, the surface of the skin must be insulated by a loosely woven fabric covering (best of animal origin) which retains the heat in its meshes yet allows an egress of moisture which is constantly imperceptibly emanated by the pores of the skin and to a superlative degree during exercise. Successive thin layers are found to be more efficacious than one thick layer owing to the dead air interspaces. The skin and its covering must be kept dry else freezing will ensue. Aside from what moisture may come from the body, wet may come from accidental immersion in streams or the air itself may be very humid--the reason for our greater sensitiveness to wet cold than to dry cold. A large factor of success in Arctic exploration has been the choice of proper clothing. These explorers have followed down to the last detail the natural clothing of the Eskimo modeled after the protective covering of Arctic animals consisting of the impervious integument itself next the body or with silk intervening. This fits loosely at the knee, waist, and wrist, enabling the evaporation of constant perspiration to the open air, especially during exercise of any kind. The body is thus kept dry and no energy is lost in heat making.