You’ve probably seen Polartec tags on myriad outdoor gear ... very warm and cozy but doesn’t trap heat like a standard fleece jacket. The Gore-Tex Windstopper ripstop trim gives the jacket ...
Also, if you want maximum insulation, founder of CrashGal Couture Leah Wise recommends choosing fleece jackets labeled as Polartec or Thermal Pro, as these are considered heavyweight fleece.