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L1 Premium Goods Theorem Men's Diffuse Jacket


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  • $120.00
  • Regular price $199.00
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New this season, the Diffuse is L1's lightest Theorem shell yet. Designed to work as hard as you do on long days exploring the backcountry. This 100% recycled 2.5-layer anorak silhouette pairs perfectly with our Dyer when you need that extra layer of warmth and performance.


3/4 Center Front Kissing Welt Zip
Inner Storm Flap
Kissing Welt Zip Hand Pockets With Large Mesh Pocket Bag
Gathered Elastic Cuffs And Hem
Shock Cord Hood Adjustment
Underarm Vent Panels
Soft Chin Guard
Key Clip


Ripstop 2.5L


Outershell: 100% Recycled Polyester
Membrane: 100% Polyurethane
Lining: 100% Polyester
Hand Pockets: 100% Polyester

20K Waterproofing

20,000mm Waterproofing

20K Breathability

20,000g Breathability

2.5-layer shell fabric

2.5 -layer shell fabric is waterproof, windproof, and breathable. The fabric features a water-repellent finish, a waterproof/breathable membrane, and a partial mesh interior lining.

Fully seam sealed

All seams and areas with stitch lines are heat sealed with water-repellent tape.


Non-insulated garment, single layer, and wind-resistant.

Regular fit

Traditional outerwear fit with room to layer, but not too loose. Relaxed through the hips and thighs with a regular leg opening

Recycled Materials

A work in progress, we’ve set a goal to work towards having a line completely made of only fully recycled fabrics in the near future. As we start this journey, our main goal is to do our part in reducing the industry’s greater impact one step at a time.


As part of our commitment to improving our environmental footprint we have entirely switched from C6 DWR containing hazardous PFC’s (per- and poly-fluorinated chemicals) to PFC-free DWR on all our fabrics and styles that require a DWR coating. The importance of a cleaner textile process is fundamental in our journey to reducing our environmental footprint.