What is the science behind how a person dresses in winter weather? Objective 1. Students will be able to choose appropriate clothing for outside winter activities. 2. Students will identify the 3 clothing layers needed for outdoor winter activities and explain why each layer is necessary. 3. Students will be able to define the terms conduction, radiation, respiration, evaporation and convection, citing specific examples in Grand Teton National Park. Background Winters are long and cold in Jackson Hole. The first heavy snows fall by November 1 and continue through April; snow and frost are poss Duration: 60 Minutes.