Gear that makes cold camping comfortable

What does camping at -30°C mean to you? A test of survival? A daredevil's feat? Today, it's being reimagined as a sought-after winter retreat. Equipped with self-powered heaters, stove-jack tents, and sophisticated insulation systems, the punishing cold is being transformed from a forbidding obstacle into a compelling attraction. / Why do hotels always give you four pillows (17:34)? On the show: Niu Honglin, Steve & Yushan