The original version of the Proton LT Hoody received a Highly Recommended rating from our Alaskan contributor, Max Neale, in 2018. He called it the “highest rated all-purpose active insulation jacket” that he tested for his Synthetic Insulated Jacket State of the Market Report.

The newest (2019-2020) version of the Proton LT Hoody features a new face fabric, lining fabric, and insulation. In addition to claims of superior air permeability and insulation, Arc’teryx boasts that the face fabric is 60 times more durable than “the industry standard” (whatever that means). Regardless, it’s one of the most comfortable insulating jackets we’ve ever used.


  • face fabric durability
  • air permeability of insulation and fabric materials
  • comfortable fit
  • quality of materials, design, and construction