I have the text in my book:
Chad Michaels bounded out of Mukluk Middle School in northern Alaska. He ran as fast as he could despite his huge boots, down-filled snow pants, mittens, and hooded parka.
I have two questions:
1) How do English people know that he bounded out of building of school? It is not "the Mukluk Middle School" which is meanining "building of school".
2) What does "down-filled snow pants" mean? Is it pants which filled with snow or something else?