G4 BOA® Boot

ITEM # PG-10400


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G4 BOA Boot


Step into Simms’ G4 Boa® Boot and elevate your fishing experience thanks to an asymmetrical Boa® system that delivers an articulated, secure fit over and across the instep. Underneath the G4 chassis you’ll find an advanced RiverTread™ platform that minimizes rigid materials in exchange for maximized proprioception—your ability to feel and adapt to an ever-changing underfoot environment. In addition, Vibram® Idrogrip outsoles provide great grip across slick underwater obstacles via multi-directional lugs—compatible with all Simms’ AlumiBite™ and HardBite™ cleats and studs. Inside the boot is an environment hardwired for warmth and comfort, featuring a lined neoprene finish, cushioned where you need it most and ultra-smooth for easy on/off performance.


2014 Award Winner


  • Simms NEW RiverTread™ Platform for guide-ready wading performance, support & traction
  • Waterproof PU-coated leather & TPU-coated textile upper for maximum abrasion-resistance & durability
  • Fully-lined with neoprene for wading warmth, cushioning & easy-on/easy-off
  • Boa® Closure System for easy-on/easy-off & a precision, on-demand fit
  • Don't forget to buy a G4 Boa® Replacement Kit
MATERIAL TECH: A waterproof PU-coated leather & TPU-coated textile upper with an asymmetrical Boa® Closure System & full neoprene lining; Built on the Simms RiverTread™ Platform with a 4.0mm Vibram® Idrogrip rubber outsole
APPROX. PAIR WEIGHT (size 10): 57.6 oz
SIZES: 07-14, whole sizes, EEE width

TAGS: , ,


Size Chart

Men's Wading Boot Size Chart

To allow proper room for the neoprene stockingfoot, find your regular shoe size in the right-hand columns and order the corresponding Simms Boot in the first column. This will typically be one size up from your normal shoe size for men and one size down for women (ie: a women's USA size 8 would take a men's boot size 7).

(Simms Boot size 5 will fit a Youth Size 4, etc.)

Simms Wading
Boot Size
5** 4 37 3 22
6** 5 38 4 23
7 6 39 5 24
8 7 40 6 25
9 8 41 7 26
10 9 42 8 27
11 10 43 9 28
12 11 44 10 29
13 12 45 11 30
14 13 46 12 31
15** 14 47 13 32
16** 15 48 14 33

Not all styles available in all sizes; please see individual boot for size specifics
** Freestone Boot - Streamtread only


Simms G4 Boa® Boot

Product Care

Boa® Boot Care:

For proper cleaning of your boots to descrease the likelihood of spreading Aquatic Invasive Species, please reference our CleanStream™ page.


If using in saltwater always clean and rinse to prevent corrosion.

Use a brush to remove dust and dirt. Choose an old vegetable brush or toothbrush. Do not use bar soap or detergents.

Do not place wet boots close to a heat source (fireplace, campfire, wood stove, radiator, heater, sunny windowsill) as this can weaken adhesives and cause materials to become brittle or shrink.

Dry using natural methods (air dry) and try to keep them out of the sun for long periods of time. Boots dry faster when positioned upside-down. If desired, stuff a sheet or two of newspaper into each boot to absorb moisture. Change the paper each hour.

If you see any mold on your boots, brush in a mixture of 80% water and 20% vinegar.

Store boots in a place where temperatures are stable and normal. Do not store footwear in attics, garages, car trunks or any unventilated spaces.

Never put boots in washing machine.


Boa® Closure System Care:

We recommend regular cleaning of the eyelets and reel mechanism to prevent sand and silt from prematurely wearing on the cables. Use the tool provided to remove the reel and rinse thoroughly on a regular basis. This will ensure a long life for your Boa® system.

Boa® cables will need replacing over time just like a normal lacing system.

Boa® replacement cables are available on the Simms website, directly from Boa® or you can purchase spares at most fly shops. Always a good idea especially on destination trips.



  • CleanStream™ is a design philosophy that runs through our line of wading footwear. While not specific to a product feature, this designation does indicate that the product includes features and/or materials that are more resistant to "hitch-hiking" organisms – have less exposed stitching, fewer ridges & pockets and utilize non-absorbent materials – all making the boots easier to inspect, clean and dry faster. All of these elements assist anglers in doing their part to prevent the spread of invasive species. For more information, please visit our CleanStream™ page or these organizations: www.cleanangling.org, www.protectyourwaters.net or www.tu.org.

  • The New RIVERTREAD™ platform is designed for the demanding angler looking for the best wading footwear on the market.  RIVERTREAD™ features Simms’ latest engineered components to maximize comfort, performance, and slip-resistance.  The molded 3D footbed with arch support and ball flex aligns the foot for all day comfort and optimizes biomechanics.  Molded dual-density EVA midsole creates extra cushioning for hiking comfort and enhances proprioception.  A Molded and minimal TPU rentention plate allows lightweight cleat retention and enhances proprioception.  A molded Vibram® Idrogrip® outsole with 4mm self-sharpening multi-directional lugs permits long lasting traction on trails, slip resistance in water and toe protection.  Also available in a 12mm Felt outsole.

  • Vibram® soles are built from the bottom up and are designed to overcome very specific obstacles on a variety of terrains. Vibram® invests heavily in research and development of products never overlooking even the most minute detail. Vibram® soles boast innovative compounds and technical sole patterns, specifically developed to meet the challenges of many different environments and applications. www.vibram.us

  • The Boa® Lacing System provides custom-comfort with smooth, even closure and no pressure points. Easy, one-handed adjustment with a secure hold that is built to last. Featuring a wire lace made of 49 strands of aircraft-grade stainless wire cable and bombproof nylon reel guides that are designed to take all of the abuse that you can throw at them. The system is designed to be easily user-repairable and replaceable. Request free replacement parts online via the Boa® Dialed In for Life™ Guarantee. www.boatechnology.com/guarantee


Customer Reviews

7 Review(s)

6 Item(s)

Love the boots Review by KM
Picked up a pair of these G4s and I have nothing, but good things to say. Awesome boots. The boa system is convenient and reliable making it easy to slip on and off. I have had these boots in freezing weather and in some muddy/sandy places and the boa system has worked flawlessly. I will never buy boots with laces again. At first I was a little weary if they would work in tough conditions, but they have worked great. The bottom of these boots grip all different types of terrain with little to no problem without the spikes. I only had one slip in that was on a creek with a slate bottom. After adding the spikes I never experienced a slip again. Great boots. Definitely worth the money! Another awesome product by Simms looking forward to their future products as well. I test gear for Gore-Tex and highly recommend these boots.

(Posted on 4/23/14)

Simply the best shoes ever for the Madison Review by Rick
I bought these hoping they would work on the Madison River. They have exceeded any expectation i had for them. By adding the optional spikes I now feel like i am safe wading the Madison. The unique round rocks are no longer an issue.

(Posted on 4/2/14)

Excellent Product! Review by Coach:CC and WR
Boots are very easy to get into and out of. Firm footing and secure tread. Good ankle support. Snug fit when dialed in with wire cables. very comfortable for all day wear!

(Posted on 2/11/14)

Not Happy Review by Red
Just recently purchased this boots and have worn them 2 times. The BOA system tightens around the ankle before tightening around your foot. In order to get a tight fit around your foot your ankle will be so tight you'll cut off circulation. I believe it has something to do with the system being located on the side of the boot rather than on the top.

I would NOT recommend this boots.

[Response from Simms Customer Care Team]
Thanks Red. This is the first we've heard this problem. If you don't mind please contact us at info@simmsfishing.com or 888.585.3570 so we can figure out the cause. That shouldn't be happening.

(Posted on 1/26/14)

Unquestionably the best wading boot on the market. Review by Nelson
Just took them out of the box and all you can say is wow. Another top quality Simms product. I will add to this review down the road after I put a few hundred Kilometers on them.

(Posted on 1/14/14)

G 3 Wading Boot Review by JOE GUIDE
(An epic choice in wading the flats. Any educated World Travel can purchase any manner of gear for their adventure of a lifetime...you may be wading the flsts off. The Seychelles...or Paris Flats or the Polish flats of Kitabas for four lb bonefish or 55 -80 lb GT.Perhaps your backyard is like mine....the lower Cape Fear delta Spartina grass flats for tailing redfish in Wilmington NC....or the Laguna Madre for hog Sized Speckled Trout. This is the only choice for the distingushed Sportsman and saltwater Flyfisherman. None other....
Your friend...
Joe Guide (www.joeguideoutfitters.com)

(Posted on 12/12/13)

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