National Park Blanket - YellowstonePendleton Yellowstone National Park Blanket Experience the history and romance of Americas National Parks. Since the early 1900s, Pendleton has honored these treasures with a collection of distinctive Park Blankets. Each blanket has a Pendleton label signifying their authenticity and a special woven label with the park name and image of an important natural feature. Like all our blankets they are woven in our own Northwest woolen mill. 100% pure