Prometheus Design Werx

Robust Without Sacrificing Exceptional Comfort

Our custom Italian milled Tech-Wool Melton is densely woven, robust and rugged, softer than typical Melton Wool, and is now easier to care for. The interior is lined with plush, luxe Polartec Retropile Shearling fleece for exceptional comfort and additional warmth, and the sleeves are lined with smooth, 3M, quilted, poly baffling.

Ample Pockets for the Necessities

Ample pockets include additional chest pocket organizers, one pen-pencil slot and a pen knife pocket, two lower hand warmer pockets, and two inside stash pockets for smartphones and pocket notebooks.

Engineered for Durability and Movement

Double reinforced elbows keep the typical wear points more durable, a touch borrowed from vintage US Navy-type work shirts of a different era, and engineered single arm-side panel construction allows for freedom of arm movement, unlike other button up shirts being made today.

Best of Both Worlds

Wool is nature's longest running performance fiber. When raised and harvested properly, is a sustainable material for use in apparel manufacturing. PDW partnered up with a family owned and operated woolen mill in Italy to create some of the finest hybrid technical textiles, that is a best-blend of old and new worlds, and machine washable for easier care.

Like our classic Woodsman Shirt, the Shearling Mountain Shirt is like one of your grandfather's favorite outdoor shirts from a vintage era, but better. Shirt-jacs fill a niche where a shirt isn't quite warm enough for chilly weather, but a full winter-weight jacket is too much for more active pursuits

Product Specs



  • Italian Milled, Premium 14 oz Tech-Wool Melton 60% Wool / 25% Polyester / 10% Polyamide / 5% Other Fiber Blend
  • 370 gsm Polartec Retropile Shearling Fleece
  • 3M Quilted Poly Baffling
  • Brushed Cotton French Twill Trim
  • Industrial Grade Metal Snaps



  • Regular Fit
  • S, M, L, XL, XXL



  • Engineered Patterning
  • Single Full Length Side Arm Panels for Full Range of Motion
  • Snap Front Placket
  • 2 Buttoned Chest Pockets w/Additional Organizer Pockets
  • 2 Lower Handwarmer Pockets
  • 2 Inside Stash Pocket for Smart-phones and Pocket notebooks
  • Industrial Grade Construction, Triple Needle Stitching, Thread and Bar-Tacks Throughout
  • No-Loss PDW Slotted Buttons
  • Double Reinforced Elbows
  • Machine Wash Cold

Cut & Sewn

Cut & Sewn:

  • California, USA

Customer Reviews

Based on 4 reviews
Jared Vidler
Freaking over-built!

I just got my shearling mountain jacket and wow! Heavy duty and purpose built. I love how the pockets are laid out. It’s definitely going to be my go-to jacket. I’ve had a shirt jacket, from Kuhl, for a while and it was good but, the PDW mountain jacket blows that thing out of the water. I’m 5’10 and 205 lbs and went with a size xl and it fits great. I’m looking forward to many adventures with this great piece of gear. Thanks PDW, keep up the good work.

Kristin Houk
Incredible quality jacket

As always, Prometheus has created an incredibly cool and high quality jacket that is so functional but also so stylish. I love having them as my sole source for special gifts for my partner- he is always thrilled with their products. This jacket has all the right things- and even has a special material at the wrist to avoid any bulk- so smart! Absolutely love it.

Brien Dulaney
Strong. Durable. Warm. Classic.

I took the leap and ordered this shirt jack on release day. Shipping to the East Coast had it here the following week thankfully. Just in time for the polar vortex that hit the US with windchill temps here going negative. This thing kept me nice and warm when those temperatures dropped. The wool is very smooth and soft to the touch yet you can feel it's a quality tight weave. The fleece inner is like butter. The quality of materials and craftsmanship are just ::chef's kiss:: This is perfect for lounging around a campfire or just getting outside when the temps drop. I don't feel too hot, and certainly not cold in it. And what is there not to love about the PDW red and black plaid?

Great Fit and Great quality. Runs true to size.

I own the PDW wool DRB Woodsman shirt and it's an awsome 3 season garment. I wanted something slightly heavier for late fall/winter wear and this fit the bill perfect. I was a little concerned that the faux shearling lining was going to make it a different cut compared to the unlined Woodsman but that was not the case. However, I will add if you plan to layer over anything thicker than a t-shirt to go up a size. I wore a long sleeve wool undershirt with no issues tho.
The additional hand warmer and two inside smart phone sized pockets are welcome features over the lighter weight Woodsman. You will come to appreciate the little details like the nylon lined sleeves that help it slide over long sleeve shirts and the extra material in the back really gives your arms and shoulders a little extra room for when you're more active. The exceptional quality of the materials and manufacturing plus the fact that the Mountain Jacket is also cut and sewn in the US was a determining factor in my decision to purchase this garment.

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