This material is considered to be water-resistant, but not waterproof. Thinsulate is an alternative to down materials. Ask any duck, feathers help to keep them warm! One of the benefits of this feather-mimicking material is that it is actually warmer than down when it becomes wet.
These materials work to wick water away from your hands while keeping them nice and toasty at the same time, but they won’t keep water at bay when exposed to super-soggy conditions over long periods of time.