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Maverick X.3
The fastest wetsuit ever.

Elite Aero Tri Suit
Wind-tunnel-tested.
Real-world-proven.

SIM Pro.3
Train smarter.

Maverick X.3
The fastest wetsuit ever.

Elite Aero Tri Suit
Wind-tunnel-tested.
Real-world-proven.

LCB Swimwear
Train like the mermaid.

T1X Transition Pack
For race day. Training day. Travel Day.

R2 Goggle
The ultimate high-performance goggle.

Maverick X.3 Thermal
The fastest cold water wetsuit ever.

Viper X.3 Ghost
Our fastest swimskin ever.

Maverick X.3
The fastest wetsuit ever.

Elite Aero Tri Suit
Wind-tunnel-tested.
Real-world-proven.

Viper X.3
The most popular swimskins in Kona.

SIM Pro.3
Train smarter. Swim faster.

R2 Goggles
Maximum forward visibility in open water.

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Men's SIM Pro.3 Buoyancy Shorts (Open Box)

Size: Extra Small

ALL OUTLET ITEMS: We accept exchanges or returns for store credit, but outlet items are not eligible for a refund. Our standard warranty still applies.

OPEN BOX ITEMS: Open box items are demo suits or returned products from customers. All open box items have undergone a detailed inspection and can be expected to perform at an elite level, but most have cosmetic blemishes. In most cases open box items have been tried on. In some cases minor repairs have been made.

The SIM Pro.3 is no less than a secret weapon for triathletes looking for gains in their swim. By giving you a small assist in buoyancy at the hips, the SIM Pro.3 lets you focus on the more nuanced parts of your stroke (timing of kick, pull and body rotation) and on efficient forward propulsion and drag reduction—rather than fighting to keep your hips up. Plus, they make training more fun and get you to the pool more often. We challenge you to wear SIM Shorts regularly and not improve your swim.

Size Chart Size Chart

Updated Construction

Yamamoto SCS Coated Stretch Knit - Easier to Get Solid, Snug Fit - Seals Out Water Better

Showing seal that keeps water out

Optimized Fit

Optimized Length and Leg Openings - Higher Rise in Back - More Comfortable Front

Showing the new fit on a swimmer

Updated Graphics

Added Color Hit to Back Waistband for Improved Technique Evaluation From the Pool Deck

Color added for visibility and evaluation

Train Like You Race® With the SIM Pro.3

The SIM is the first practical triathlon and swim training tool to mimic the body position and experience of a wetsuit swim by lifting you up — without overheating from wearing a wetsuit in an 80°F pool. This patent-pending suit is a game changer. It's better than a pull buoy, because it lets you kick and turn naturally. It's also gives just a touch of warmth for those cold morning workouts. The SIM makes every swim a race-specific training workout. Once you try it, you won't ever want to go back. Note, these shorts are designed for the pool and should have excellent durability if you rinse them after use with fresh water and dry them thoroughly.

SIM PRO.3 SIZE TIP

Fit tip: SIM Shorts are neoprene and will loosen slightly in the water. However, they do have a drawcord for adjustment.

SIM PRO.3 DETAILS

Get the Fastest Body Position

The SIM Pro lifts up your hips just like a wetsuit, putting you in the fastest position possible and helping your body develop the muscle memory you need on race day. Most top wetsuit manufacturers focus on buoyancy alone.  Sure, wetsuits help lift you up, but that's not enough – and in some cases it can really get in the way of fast swimming. To get the fastest body position, you have to remove buoyancy, mass and resistance from the places you don't want it. With the SIM Pro, we add buoyancy to the hips and legs, creating the fastest position possible.  We also use Yamamoto's SCS coating to further reduce form drag.  We're confident you'll feel the ROKA difference as soon as you jump in the water.

Improve Your Technique

If you want to swim faster with less effort, then rotation matters a LOT.  A fast freestyle requires effective rotation along your centerline to generate power and speed in the most propulsive phase of your stroke.  The Maverick Pro leverages basic laws of physics.  We call our application of those laws "RS2" - the ROKA Speed Stripes.  It's science, and it will make you faster.

The majority of the suits on the market get this problem dead wrong.  We did a LOT of trial and testing to get this right.  Many suits, even the most expensive, add buoyancy to the lateral or outside parts of a wetsuit, but using basic physics, it's easy to see that it is the equivalent of adding weights to your cycling shoes and pedals!  It inhibits the power phase of your stroke, makes it really hard for you to rotate properly, and makes you expend more energy.  Our patent-pending suit design enhances the power phase of your stroke and encourages quick, easy rotation along your centerline.  And if you over-rotate when you swim, you will be able to feel that more easily in our suit.  All of that translates to faster swimming with less effort.

Tech Specs

Yamamoto Neoprene

For the SIM Pro.3, we use the exact same materials as its big brother, the Maverick Pro Wetsuit. This provides the exact feel you'll have on race day. "Training Like You Race" begins with developing precise muscular and neurological adaptations — the SIM Pro.3 lets you do that.

The SIM Pro.3 is 100% premium Yamamoto neoprene from Japan.  We use Yamamoto #39 SCS coated neoprene in varying thicknesses and use Yamamoto's Aerodome neoprene on the centerline (front and back).  #39 is a long-time favorite in premium triathlon suits and offers an excellent balance of performance and cost.  For the waistband, we use an advanced textile from Yamamoto to provide a better seal from water entry and folded neoprene can provide.  SCS is Yamamoto's proprietary hydrophobic surface coating.  For the centerline panel, Yamamoto Aerodome is a sandwiched neoprene that contains a perforated layer between two solid layers.  This composition traps air inside little chambers and improves buoyancy while reducing weight.  

Frequently Asked Questions (FAQ)

Q: What Is The Difference Between The SIM Pro.3 And The SIM Pro II?

There are two main updates we have made:
    1. Buoyancy: We’ve added more buoyancy to the SIM Pro.3 shorts by adding thickness in certain areas. Now your legs and hips ride a bit higher, helping SIM-ulate how a full wetsuit may feel and keep you in a better “downhill” swimming position.
    2. Comfort: We’ve tweaked the paneling and updated the internal liners of the SIM Pro.3 for a more comfortable fit across more body types.

    Q: Can I wear the SIM Pro.3 in a race?

    • The SIM Pro.3 is considered by USAT rules to be the same as a wetsuit. Therefore, you may wear the SIM Pro.3 in a race where wetsuits are permitted, but you may not wear it in a non-wetsuit race.

    Q: Can I wear the SIM Pro.3 in the pool?

    • Yes, absolutely. The SIM Pro.3 was designed for pool swimming. Just rinse it with fresh water after use and hang dry inside out.  

    SIM Size Chart

    WAIST: 26" - 27"
    HIPS: 30" - 32"
    XS
    WAIST: 28" - 29"
    HIPS: 33" - 35"
    S
    WAIST: 30" - 32"
    HIPS: 36" - 38"
    M
    WAIST: 32" - 34"
    HIPS: 39" - 41"
    L
    WAIST: 34" - 36"
    HIPS: 41" - 43"
    XL
    WAIST: 36" - 38"
    HIPS: 43" - 45"
    XXL
    WAIST: 66cm - 69cm
    HIPS: 76cm - 82cm
    XS
    WAIST: 70cm - 74cm
    HIPS: 83cm - 90cm
    S
    WAIST: 75cm - 81cm
    HIPS: 91cm - 97cm
    M
    WAIST: 81cm - 86cm
    HIPS: 98cm - 104cm
    L
    WAIST: 86cm - 91cm
    HIPS: 104cm - 109cm
    XL
    WAIST: 91cm - 96cm
    HIPS: 109cm - 114cm
    XXL

    Overall rating: 4.8033657 / 5 from 1129 reviews.

    AI Generated Review Summary

    The Men's SIM Pro.3 Buoyancy Shorts are praised for their excellent buoyancy, which aids swimmers in maintaining body position and improving speed and technique. Customers also appreciate the comfortable feel and great fit of the shorts, though opinions on size vary. Despite being open box items with potential cosmetic blemishes, the shorts are noted for their high quality and effectiveness in both pool and open water.

    Summary topics

    • Training Effectiveness (4%): It was highlighted by customers that the training tool is great, excellent, awesome, and perfect.
    • Comfort in Water (5%): Customers keep praising the amazing feel of these shorts, with many mentioning how great they feel in the water.
    • Buoyancy Performance (9%): Customers loved the buoyancy, with many describing it as the best they've ever had.
    • Swimming Performance (8%): Customers raved about the swim, mentioning that it greatly improved their swimming speed and technique.
    • Product Quality (12%): It was noted by customers that the quality of the product is consistently great, excellent, and amazing.

    Review topics: [].

    Review highlights

    • "Awesome - greatly improved my open water swimming and training in the sf bay - excellent quality in every way."Christopher F.
    • "Great comfort, buoyancy and fit."Daron F.
    • "Great construction, good sim buoyancy and the look is nice"Patricio R.

    Reviews

    Game Changer

    "I noticed that I was able to maintain my pace more comfortably and swim for longer periods without feeling as restricted. The shorts provide excellent freedom of movement while still offering the support needed during longer training sessions. The quality and attention to detail are exactly what I would expect from a high-performance swim product. If you’re looking for swim shorts that are comfortable, durable, and designed with performance in mind, I highly recommend the ROKA SIM PRO 3. They have become a valuable part of my swim training and have helped me feel faster, more efficient, and more comfortable in the water."

    Jason C. (5/5)

    Awesome

    "I committed to a triathlon fairly last minute and training began right away. I quickly found out how much improvement I needed to make with my swimming and some quick research made these look like a no brainer. I picked up a pair and they have been extremely helpful with getting my form dialed in and are very helpful while training in a TX summer for an open water race in wetsuit water on the coast this fall."

    Dane T. (5/5)

    Amazing shorts

    "Great fit! Maybe considered getting a size up but the Large I got fits perfectly really as per sizing guidance"

    Jobert F. (5/5)

    "These shorts are nothing short of amazing! They have absolutely helped me maintain hip position and level out my legs from the first time Inused them. For context I’m 5’5”, 150lbs"

    Adolph (5/5)

    Amazing shorts!

    "Used in my first triathlon of olympic distance. felt great and fit just right. I bought a size medium and I usually wear a 32 side swim suit or pant. 180cm tall"

    Tyler B. (5/5)

    The best swim I had in ten plus years doing triathlons

    "I tried first in the pool and cut my times by 4-5 minutes. I finally used it race day and finished my Olympic swim in a record time for me almost 6 minutes faster."

    Jorge H. (5/5)

    "Fits well and comfortable. Xs for 5'11 , 135-140 lbs. No effort floating. Not racing for anything, just routinely swimming from my paddle board. Traps heat rather well."

    Caleb (5/5)

    Delivery and qualified

    "It’s delivered very quickly and with great quality product."

    Benildus V. (5/5)

    Great Overall Purchase

    "Very great shorts especially for helping keep hips up when swimming. I always struggled with keeping my hips up and these helped out greatly. I am a 35” waist and ordered XL’s. I might order XXL next time because they’re very tight but I understand that’s the idea."

    Michael H. (5/5)

    buoyancy made swimming much easier

    "comfortable, even though tight fit, wore it for a couple hours walking around playing with kids and felt surprisingly comfy"

    Wenchiang H. (5/5)

    Q&A

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