ST3 Tether System
ST3 Tether System
ST3 Tether System
ST3 Tether System
ST3 Tether System
ST3 Tether System
ST3 Tether System
ST3 Tether System

ST3 Tether System

 

Train Harder. Swim Smarter.

The ST3 Swim Tether features a triple FlexRod design for maximum lift and smooth resistance. It’s ideal for swimmers who want a more natural body position and a better training experience—without relying on jets.

  • Triple Rod System for lift and stability
  • ComfortFit Belt for secure, chafe-free fit
  • Built in the USA with premium, durable materials
  • Sets up in under 30 minutes

What’s in the Box

  • ST3 FlexRod Assembly (3 rods)
  • Adjustable ComfortFit Belt
  • Stretch Cord + Carabiner (choose your length)
  • Premium Carry Bag

All components are precision-machined, UV-coated, and corrosion-resistant for long-lasting performance.

Cord Selection & Installation

Choosing the Right Cord

Cord length depends on your pool setup, install location, and swimmer size. Stretch cords extend roughly ⅓ beyond their resting length.

  • 4.5 ft – Swim spas under 10 ft
  • 6 ft – Pools under 14 ft
  • 8 ft – Most standard pools
  • 15+ ft – Extended installs or large pools

Installation Options

Base plate installs in under 30 minutes. Choose the one that matches your deck:

Need help? View the full Installation Guide.

Not Sure if ST3 is Right for You?

Compare all Swim Tether models side-by-side to find the best fit for your pool and goals.

→ Compare Models

 

Quick Specs

Overall Height 69.38 in
Height Above Base 66.75 in
Rod Material UV-coated fiberglass (3 rods)
Belt Type Adjustable ComfortFit for waist circumference 24 to 60 in
Cord Stretch ~33% of static length
Install Time Under 30 minutes
Warranty 1-Year Reliable Performance Guarantee

Regular price $289.95 Sale price$259.95 Save $30.00
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Shipping calculated at checkout.

Customer Reviews

Based on 39 reviews
97%
(38)
3%
(1)
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G
Gordon (Luton, ENG)
Tell us how likely you are to recommend Swim Tether to others—based on your install, performance, and overall experience.:
0 - Not at all confident
10 - 100% would recommend
What did you like most—easy setup, sturdy design, swim experience, or something else?: The simplicity and unobtrusive appearance
We’re always improving. If anything felt unclear or could be better, let us know.: A bit more guidance could be useful. It’s been trial and error trying to get the best length of tether
Sharing your setup helps others find the right fit.: I’ve got a T3, plus the ‘Ultimate fitness bundle, as I wanted to see whether ankle straps worked better than waist belt. My conclusion is that for free style the ankle straps are better (legs tend to sink with waist belt), but for Breast stroke the waist belt is easier
Transforms a leisure pool into something useful

We inherited an indoor pool with a new house purchase, which although relaxing isn’t big enough (8m) for any form of exercise. I considered a counter current machine, but the effort and cost (and bulk) put me off. The Tether has made all the difference, now we are both swimming hard for 30 minutes daily.

D
Denise (Las Vegas, NV)
easy way to get a good workout in a small pool

way, way better than any of the tethers on amazon. the quality is great! i love not having to go to a pool at a gym and deal with creepers

H
Hogan (College Station, TX)
Better than expected

We built a relatively small pool so we could heat it all Winter and cool it all Summer. Swim tether allows us to swim in place in our pool. It was easy to install the anchor into the coping, and very easy to swim in place with a pool buoy, snorkel and goggles…just like I use in a lap pool. Even better, my Garmin does a very good job calculating strokes, distance, strokes/minute, etc…all the same stats I get when swimming laps in a longer pool. I am super impressed with the ST3.