The outer fabric is made from a high-quality, durable water-repellent material and finished with waterproof zippers which keeps its performance function after years of use. Thanks to the removable responsibly-sourced down filling, it can be adjusted to fit warmer days. The Bugaboo performance winter footmuff is your most trusted, high-performance winter accessory to keep your baby warm, dry and comfortable on even the coldest and wettest days.