Women's Midstream Insulated Jacket

Lightweight PrimaLoft® Gold-insulated jacket fine-tuned for cool-weather layering thanks to a peerless warmth-to-weight ratio.
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It's no secret that layering helps keep us warm, but it's easy to end up feeling a little overstuffed with bulky layers in our effort to stay warm. Our women's Midstream Insulated Jacket is specifically cut for a woman's body and features PrimaLoft® Gold for the highest warmth-to-weight ratio available with synthetic insulation. The thin profile and lightweight feel of this jacket keep you moving and casting freely, without feeling over-layered. It offers unmatched warmth for its volume and is finished with a smooth Pertex® face for wind resistance.


  • PrimaLoft® Gold insulation provides the highest warmth-to-weight ratio in synthetic insulation
  • Lightweight and wind-resistant Pertex® fabric
  • High-loft insulation in body and sleeves
  • Zippered chest pocket; Zippered hand-warmer pockets
  • Internal elastic cuff and adjustable hem
  • FABRIC TECH: Face: Pertex® Microlight 30D 100% nylon ripstop;Insulation: PrimaLoft® Gold 60 g in body / 40 g in sleeves;Liner: 30D 100% polyester


  • Primaloft® Gold insulation maintains 90% of its warmth when wet and provides the highest warmth to weight ratio of any synthetic insulation available.

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Reviews (1)

  1. This jacket is perfect!


    The Midstream Jacket is by far my favorite piece from Simms (aside from my waders, of course)! This jacket is warm, lightweight, compact, and versatile. I can either wear my Midstream Jacket as an outer layer with a shirt and sweatshirt under it, or I can wear it as a mid-layer with a heavier coat on top of it. The elastic wristbands provide a tight seal when gloves are needed, and they ensure your sleeves remain above the water when you don't feel like getting everything soaked. The Midstream Jacket has become my go to piece for every day use.