: Measures how well sweat vapor escapes. Higher numbers prevent you from getting "swampy" during intense riding. What To Look For When Choosing a Ski or Snowboard Jacket
Look for these two numbers (e.g., 15k/15k) to gauge performance:
: A "complete system" consisting of a waterproof shell and a zip-out insulating liner that can be worn separately. 2. Technical Specs (The "K" Ratings)