Our fastest swimskin, period. With particular gains for athletes wearing a short-sleeved tri kit.
The Viper X.3 Ghost is engineered for pure speed, minimizing both surface and form drag. Built on our proven X.3 platform, this next-gen swimskin introduces a new era of hydrodynamic performance with advanced hydrophobic materials—in a color that's easy to spot and keeps you cooler in intense sun.
Patented IXI™ internal streamline support connects your core from shoulders to hips, locking you into a streamlined position.
Patented ARMS-UP™ technology delivers sleeveless-like shoulder freedom in a short sleeve suit.
Our fastest material ever repels water on contact, maintaining ultra-low drag from start to finish.
Seamless, laser-bonded construction delivers a second-skin feel that vanishes in motion.
WHAT'S A SWIMSKIN? AND WHEN TO HAVE ONE.
Swimskins are used in warm water races (above 76.1°F / 24.5°C) when wetsuits aren’t legal. They reduce drag by covering your tri kit with an ultra fast, hydrophobic layer—and will save you several minutes in the water.
Because race-day water temps can swing by a few degrees, it’s smart to pack a swimskin for any race where water is expected to be over 70°F / 21°C.
Wondering the water temp for your race? This page shows the average historical water temperature for every IRONMAN and IRONMAN 70.3 race in the world.
"Shaved and tapered" easy speed. Invisible to the water, with an ultra-slick skin that slides through the water, thanks to advanced hydrophobic textiles and laser-bonded seams.
Taut and straight through your core from IXI™ internal streamline support—and more propulsive than ever from a suit that connects hips to shoulders for sharper power transfer.
"Shaved and tapered" easy speed. Invisible to the water, with an ultra-slick skin that slides through the water, thanks to advanced hydrophobic textiles and laser-bonded seams.
Taut and straight through your core from IXI™ internal streamline support—and more propulsive than ever from a suit that connects hips to shoulders for sharper power transfer.
Who it's built for
Who it's built for
Athletes racing in short-sleeve kits—will get maximum speed benefits from fully covering the kit in a short-sleeve swimskin.
Athletes looking for max speed in non-wetsuit races—to gap the competition or to hang in the pack using fewer heartbeats.
Less experienced swimmers—will benefit from the extra core support in X.3 models to reduce "snaking" in the water.
Athletes racing long course—will benefit from the extra body line support and comfort in X.3 models as core muscles fatigue deep into the swim.
Athletes racing in short-sleeve kits—will get maximum speed benefits from fully covering the kit in a short-sleeve swimskin.
Athletes looking for max speed in non-wetsuit races—to gap the competition or to hang in the pack using fewer heartbeats.
Less experienced swimmers—will benefit from the extra core support in X.3 models to reduce "snaking" in the water.
Athletes racing long course—will benefit from the extra body line support and comfort in X.3 models as core muscles fatigue deep into the swim.
What makes it fast
What makes it fast
IXI™ Internal Streamline Support—Patented core support taping keeps your body straight and connects your hips to your shoulders, improving efficiency and power transfer.
ARMS-UP™ construction—Unmatched shoulder freedom in a short-sleeve design.
Precision-Engineered Textiles—Ultralight, low absorption textile with a unique stretch profile optimized for speed: high stretch radially (for breathing and comfort); low stretch vertically (for core support). Gentle skin feel for comfort.
Hydrophobic Coating—Repels water and reduces surface drag and absorption.
Laser-Cut Bonded Seams—Improves comfort (no stitching!) and reduces surface drag.
Quick Release Auto-Lock YKK Zipper—Eliminates lanyard, reducing drag. Quick release ensures a lightning fast T1: flip down to lock; flip up to release.
Silicone Leg Grippers—Printed silicone on inside of leg opening for a straight seam cut and no sausage leg.
IXI™ Internal Streamline Support—Patented core support taping keeps your body straight and connects your hips to your shoulders, improving efficiency and power transfer.
ARMS-UP™ construction—Unmatched shoulder freedom in a short-sleeve design.
Precision-Engineered Textiles—Ultralight, low absorption textile with a unique stretch profile optimized for speed: high stretch radially (for breathing and comfort); low stretch vertically (for core support). Gentle skin feel for comfort.
Hydrophobic Coating—Repels water and reduces surface drag and absorption.
Laser-Cut Bonded Seams—Improves comfort (no stitching!) and reduces surface drag.
Quick Release Auto-Lock YKK Zipper—Eliminates lanyard, reducing drag. Quick release ensures a lightning fast T1: flip down to lock; flip up to release.
Silicone Leg Grippers—Printed silicone on inside of leg opening for a straight seam cut and no sausage leg.
A swimskin is a thin, compressive suit designed to be worn over a triathlon kit
for warm water swims where wetsuits are not allowed.
FASTEST FOR SHORT SLEEVE TRI KITS
Overhauled Arms-Up™ pattern and new material offers significantly improved flexibility vs. Viper X.3. Plus lower surface drag and better body line support.
OUR FASTEST SLEEVELESS SWIMSKIN
An all-new fabric reduces drag on two fronts: (1) lower surface drag; (2) lower form drag from a tight body line enabled by a precisely engineered panel layup and IXI™ Support.
FULL COVERAGE OF SHORT SLEEVE KITS
Esp. beneficial for athletes in a sleeved tri kit, the Viper X.3 Ghost features patented Arms-Up™ design and IXI™ taping to support a streamlined body.
MINIMIZED DRAG THRU CORE SUPPORT
IXI™ internal streamline support stabilizes your core & connects hips to shoulders, improving power xfer & reducing form drag, esp. in longer races when your core fatigues.
PERFORMANCE MEETS VALUE.
All the drag reduction of our X.3 models: hydrophobic material, bonded seams, lanyard-free zipper, minus the core support.
Patented Arms-Up™ Technology
Our patented Arms-Up™ design means the suit "wants" your arms raised above shoulder level, rather than hanging down at the side. This makes the recovery phase of your freestyle easier, resulting in less fatigue in a long race
Yes
No
Yes
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No
IXI™ Streamline Support Taping
Patented IXI™ core support taping streamlines your body and connects your hips to your shoulders for better rotation. Reinforces proper posture in the water, which is especially beneficial in longer races where your body line tends to break down
Yes
Yes
Yes
Yes
No
Lower Back Core Compression Zone
An updated lower back panel provides enhanced core compression, better support and improved posture in the water. It also reduces the bubbling effect of the fabric in the small of your back to eliminate drag
Yes
Yes
Yes
Yes
No
YKK Auto-lock Zipper
YKK #3 semi-autolock zipper with low drag, reverse coil zipper tape - no lanyard needed
Yes
Yes
Yes
Yes
Yes
Meets World Triathlon Standards for Non-Wetsuit Swims
Yes
Yes
Yes
Yes
Yes
Materials
Premium Materials
New stretch-woven textile has smoother against-the-skin feel, more structure for improved body line support, and lighter weight for less water absorption
New stretch-woven textile has smoother against-the-skin feel, more structure for improved body line support, and lighter weight for less water absorption
Italian stretch-woven hydrophobic textiles limit drag, and adjusted seams reduce pressure points + chafing
Italian stretch-woven hydrophobic textiles limit drag, and adjusted seams reduce pressure points + chafing
A SCS (Super Composite Skin) Hydrophobic Nano Coating reduces surface drag for more speed while also improving durability
Yes
Yes
Yes
Yes
Yes
Bonded Seams
Yes
Yes
Yes
Yes
Yes
Silicone Leg Gripper
Printed silicone leg grippers on the inside of the leg opening for a straight seam cut and no sausage leg
Yes
Yes
Yes
Yes
Yes
VIPER SWIMSKIN Size Chart
FIT TIPS
Swimskins should fit snugly but comfortably without inhibiting your breathing or arm movement. Fit may feel different while swimming vs. on land, so make sure to try the suit in the water. They are meant to have a tight, compression fit, like a competition pool swimming suit.
Note that swimskins are meant to be worn on top of a race top/bottom or race suit only for the swim portion of the race. They are very specific, high performance garments not meant to be worn alone like traditional swimwear and the suits can be see-through under certain light or when wet. Undergarments such as a tri kit or swimsuit are strongly advised.
Your race kit will affect the fit slightly, so please be sure to try them on and swim in them with your race kit or another suit underneath.
Select your height, then locate your suggested size based on your weight.
"This is the third brand I have tried on and the second ROKA. I tried on the sleeved one first but I personally seem to not get a good fit with ROKA on the sleeved ones. The Viper X is fantastic and feels like it’s non existent on me. Very much fulfills the goal of a swim skin."
— Leonard M. (5/5)
Does its job, but won't swim instead of you
"I ordered according to the size guide on the webpage, and it is true to size. The premium-quality touch and smoothly functioning zipper enhance the experience—watching a video on gearing up and removing the suit is helpful. Wearing it definitely helps with swimming, though it is important to become familiar with how the suit feels."