G4 Pro™ Jacket



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G4 Pro Jacket - Gunmetal


Guides Day Off is just another day on around these parts. It means time to prototype new patterns and techniques, and to source and mark beasts for future reference. Because working-class anglers rarely get a breather, Simms built its don’t-quit jacket for the extreme weather grind. The stormproof G4 Pro™ is cutting-edge equipped to keep you dry, warm, and comfortable via 3-layer GORE -TEX® Pro Shell fabric, and it features an intuitive array of fishing-first elements at your finger tips. Jackets are kitted with 7 storage pockets; 2 bellowed chest pockets, 2 zippered chest pockets, 2 zippered tippet pockets and 1 large back pocket. Quick drying microfleece-lined hand warmer keep your digits frost-free in subzero temps, while water-resistant pit zips allow you to air out the funk when the fishing heats up. Simms G4 PRO™. Expert abused. Angling-addict approved.


  • Full-length YKK® VT9 AquaGuard® VISLON® water-resistant center-front zipper with zipper flap for additional protection
  • Heavier nylon fabric in shoulders for additional durability and lighter nylon fabric in body for enhanced packability
  • Seven storage pockets including two bellowed chest pockets, two zippered chest pockets, two zippered Tippet pockets and one large capacity back pocket
  • Quick-drying, microfleece-lined hand warmer pockets with zipper closure
  • The only Simms rain jacket featuring water-resistant pit zips
  • Adjustable storm hood, adjustable cuffs and adjustable shock cord hem
  • Two patented built-in retractors
  • 3-layer GORE-TEX® Pro Shell fabric; 100% Nylon face
  • Approximate weight: 33 oz
Simms G4 Pro Fishing Jacket


Size Chart

Men's Outerwear Top Size Chart

Men's Sizes Chest* Neck*Sleeve*
S 36" - 38" 14.5" - 15" 33" - 34"
M 39" - 41" 15.5" - 16" 34" - 35"
L 42" - 45" 16.5" - 17" 35" - 36"
XL 46" - 48" 17.5" - 18" 36" - 37"
XXL 49" - 51" 18.5" - 19" 37" - 38"

* These are body measurements


G4 Pro™ Jacket

Why Outerwear?

GORE-TEX® Technology and Simms Gear

Product Care

GORE-TEX® Outerwear Care:

Cleaning your GORE-TEX® garments regularly will extend the life of the product. It will also keep them breathable as dirt and oil can clog the GORE-TEX® membrane over time.

It is critical to wash jackets. Natural oils can damage the GORE-TEX® tape and adhesives causing a peeling effect.

Machine wash warm. Do not use fabric softener or bleach.

Remember to zip all pockets and close all Velcro cuffs before washing to prevent any damage caused by the machine.

Tumble dry on warm setting making sure not to use a high heat setting. Drying on warm will actually reactivate the DWR coating.



  • GORE-TEX® PRO SHELL outerwear is waterproof, exceptionally lightweight and offers the ultimate in breathability, durability and extended comfort. Constructed with a woven backer, GORE-TEX® Pro Shell garments slide easily over other layers and offer exceptional tear strength and internal abrasion-resistance.

  • The AquaGuard® VISLON® zipper is a revolutionary new design from the global leader in containment closures. The AquaGuard® VISLON® zipper's new tooth design provides enhanced fluid repellency vs. coil or standard individual element closures, while increasing the number of design and color options for your application.


Customer Reviews

28 Review(s)

Items 1 to 10 of 28 total

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Bought for Alaska and put it through all the abuse you can find Review by Dale
Bought this for a "Bucket List" trip to fish the incredible Kvichak River in Southwest Alaska. We encountered every kind of weather in 5 days. We were in snow, ice, sun and always 30-40 degrees. This jacket was perfect. It is easy to wear over 4-5 layers of clothes and will absolutely keep you dry. I didn't have to utilize all the pockets and other features because the Alaska Sportsman's Lodge has the best guides I have every had the pleasure of fishing with. As a result, I got to fish and catch some incredible Rainbows. This jacket is without peer in my experience. Great job Simms.

(Posted on 10/7/13)

Super Super Super Review by Martin
G4 PRO je jedna z najlepších vecí akú som mal na rybačke v nepriaznivom počasí. Celkove oblečenie, doplnky značky Simms je super.

(Posted on 8/31/13)

Great Jacket which just needs few little improvement to make a five Review by Boris the Blade
Awesome jacket, keeps you dry in any weather, light to allow you to layer below, great accessories and storage. Bright colour ones are cool in photos. Steel grey one or one using the bright green from Hyalite colour would be cool.

Few possible improvements:
1. Improve the hem by adding draining holes or make bottom section using mash so water drains easily
2. Improve the cuffs by adding the stretchy neoprene like the new Pro Dry jacket
3. Make the jacket 2 inch longer
4. We have seen some wear on inside lining when Spey casting, possible rubbing the badges and tags on wader suspenders or front wader accessory / storage area.

[Response from Simms Customer Care Team]
Thanks for the straightforward review. At Simms, we are always looking for ways to improve our products, and hearing from our customers is a great way to find out how we can build better gear. To talk to us or provide more feedback, ring us at 888.585.3570 or email [email protected]

(Posted on 6/21/13)

Worked beautifully in miserable Montana weather Review by DocScott
I recently wore my G4 pro on an April trip in Montana in a variety of sketchy weather ranging from wind and cool rain on the Yellowstone to a miserably snowy day on the Bitteroot to a 19 degree morning on Rock Creek and finally a windy sprinkling day on the Big Hole. The jacket kept me dry in all conditions and warm due to it's wind blocking effects. The large back pocket was perfect for adding and removing layers as weather conditions changed. The front pockets made my slingpack all but useless as i could store all my essential tools and flies right in my jacket. Awesome to own this thing.

(Posted on 4/14/13)

Great Value very reliable Review by Tyler C
I have had my G4 waders and Jacket for two full guiding seasons now and they have worked flawlessly. Last week while fishing a local river in mid-january in the northern rockies I had a slip and fall in the river, I then proceeded to float along for a ways, quite startled at my state of affairs. Once I had sorted my self out and managed to get my footing. I was very surprised to see that since I hadn't dunked right under the water I was still bone dry and able to keep fishing. 150 plus days and still completely waterproof. Thanks Simms.

(Posted on 1/21/13)

G-4 Pro Jacket Review by me blake
Replaced a Cloudveil jacket that is no longer made. Can't buy Pategonia since they screwed all the flyfishing reps... Works perfect in those downpours we've had since October. Way more confortable then my old rain jacket, plus the pit zips don't leak. Even works for mushroom hunting when the river is blown out. Great fit, totally dry, and just in time for the moonsoon season....

(Posted on 11/8/12)

Durable and Dry Review by Ryan
I've used this jacket for years guiding in Alaska, and it will keep you dry! When you are in a place like AK, going to be on the water for 10hr days while its raining, this will keep you as dry as can be. My only complaint would be that sometimes while tying a fly on or what not, I'll put the rod in my pit and the line will get stuck on the pit zips. My next jacket won't have pit zips.

(Posted on 8/9/12)

Best Rain Jacket Ever Review by The Reptile
I used my G4 first in Alaska and it made my week. I love fishing in the rain and cold with this jacket. Home in Oregon swinging flies in bad weather is no problem with this jacket. Freezing cold - just cinch up the waste and wrist and you are like toast - dry and warm. Simms did a greatd job on this jacket. Best Rain Jacket Ever.

(Posted on 7/16/12)

Not worth the money Review by Spencer
I was relatively pleased with this jacket for the first few months I owned it, but then things began going wrong. Within the first week of ownership, one of the zingers broke, dropping my hemostats into the river. The second zinger failed a few months later. Still it was keeping me dry, but that would change once winter rolled around. By last March, having only owned the jacket for 5 months, it was already leaking pretty bad. By May, I was getting completely soaked within a few hours of a decent rain. For a $500 jacket, this is inexcusable. This Fall, in anticipation of rain, I patched some holes in the shoulders and sleeves, and reapplied the DWR coating, per Simms instructions. Doing this improved the waterproofing for a month or so, but here I am again, in Winter, with a jacket that leaks like crazy. I've probably worn this jacket 40 times in total, and it's pretty much worthless at this point. Not a good deal.

(Posted on 7/16/12)

Simply the Best! Review by Gaz
When you fish in Ireland be prepared to have all four seasons within a day! When its bad, its bad, theres nothing to stop the rain and wind rolling off the Atlantic. After 8 hours solid fishing in non stop rain and your boat partner has stopped talking because they're soaked to the skin, your still dry and smiling.

(Posted on 7/16/12)

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