Featherweight, windproof and incredibly warm, don't let this jacket's ultra light weight fool you. It's as comfortable as down with SuperLoftTM insulation providing the warming power. The shell is windproof to protect against tough weather and a water-resistant finish sheds rain, snow and sleet. Zips in as the perfect insulation layer for our system outerwear shells so you can wear it year round. The best part - it packs so small you can bring it anywhere.