Ask most swimmers why they clip on a tow float and you'll get the same answer: visibility. It's bright, it floats, boaters can spot it from a distance, and it gives you something to hold onto if you need a breather. Fair enough. But that's only half the equation.
Attach a leash to your hip for an hour and you've built a small feedback instrument, whether you meant to or not. It drags. It swings. It tracks your position on the surface the entire time you're swimming below it. Coaches will talk your ear off about catch, rotation, and hip drive, yet almost nobody mentions the float trailing behind every open-water session, quietly recording how your stroke actually behaves.
What That Little Pull Behind You Is Doing
A tow float never sits still. It rides the surface, connected by a leash to a belt around your waist or a clip on the back of your wetsuit, and it responds to everything happening below it. That leash sits roughly at hip height. The float itself creates a constant, gentle pull: backward, and slightly up.
Two things come from that. First, drag. Not much, but enough to notice at faster paces, since resistance from a floating object increases with speed. Second, and more useful if you're trying to improve: the float acts like a lever off your hips. Any asymmetry in your stroke, a stronger pull on one side, a kick that scissors instead of staying tight, shows up as sideways movement in the float's path.
A wetsuit is already changing your position in the water before the float enters the picture. Neoprene buoyancy lifts your hips and legs, cutting the drag that comes from a lower body sinking out of line. Now you've got two forces working on that same region at once: one lifting from below, one tugging from behind. That's why some swimmers barely register a float and others swear it's fighting their kick the whole swim.
Reading the Wake
You can't watch your own float mid-stroke. But a training partner, a coach on a paddleboard, or someone filming from the pool deck can. Here's what that footage tends to reveal.
- A float that swings wide left, then wide right, in a steady rhythm usually points to overreaching on entry: the hand crossing the midline and dragging the whole body off a straight line, stroke after stroke.
- A float that drifts consistently to one side over a longer set, rather than swinging evenly both directions, often reveals a stronger pull on the dominant arm. Plenty of swimmers never notice this imbalance until it's laid out behind them in plain sight.
- A float that bounces vertically with each kick cycle can mean the kick is too vertical rather than compact, wasting energy pushing water toward the surface instead of driving the body forward.
None of this replaces real stroke analysis. But paired with video from the pool deck, it becomes a second source of information you already own, since most open-water swimmers are strapping on a float anyway.
Training With the Drag Instead of Around It
Sighting drills, pace-change sets, and technique-focused open-water sessions can put that small resistance to work on purpose. Try a set of 200-meter repeats with the float attached, then swim the same distance without it. You'll feel exactly how much your stroke rate and length shift under that extra load. It's not a substitute for resistance bands or drag suits built for pool strength work. Think of it as a gentler version of the same idea: swim against mild, constant resistance, then swim free of it, and pay attention to what changes.
Here's how that might play out in practice. A masters swimmer training twice a week in open water ahead of a half-iron distance race sets her leash at roughly two feet and swims her steady-state sets with the float attached. For the final 400 meters of each session, she drops it. Over several weeks, that contrast becomes her check on whether her stroke length is holding up under fatigue, because the float makes any breakdown in technique impossible to ignore.
Leash Length Changes What You're Actually Feeling
A shorter leash keeps the float close to your hips and transmits more resistance directly, which gives you a sharper read on hip-level rotation. A longer leash lets the float trail farther back. That smooths the signal but cuts down on interference with your kick, which suits swimmers who find a close float clipping their feet on recovery.
Where you attach it matters too. A waist belt sits independent of your wetsuit and can ride up or shift over a long swim, changing the leash angle as the session wears on. A clip fixed to the lower back of a wetsuit stays put relative to the suit's buoyancy zone, keeping the float's pull more consistent from start to finish. Neither setup wins outright. It comes down to comfort, and how much you want that feedback to stay stable across a full hour in open water.
Caring for It Like You'd Care for a Wetsuit
A tow float lives through the same conditions as your wetsuit: saltwater, chlorine, sun, and endless folding into a swim bag. The same habits apply.
- Rinse it in fresh water after every open-water or pool session to clear salt and chlorine residue before either one breaks down the coating.
- Dry it out of direct sunlight. UV exposure degrades the fabric and the internal bladder faster than water contact ever will.
- Store it loosely instead of rolled tight. Permanent creases weaken seams over time.
- Check the inflation valve now and then for grit or salt buildup that can cause a slow leak.
A float that won't hold air through a full session isn't doing its job, whether that job is visibility or technique feedback.
Where It Fits on Race Day
Plenty of open-water swim groups and race organizers require a tow float for training swims, especially in less-supervised settings. Rules around tow floats during actual competition vary by event and sanctioning body, and they shift from season to season. Check current guidance from your specific race organizer before assuming a training habit carries straight over to race day.
One thing worth stating outright: a tow float isn't a certified personal flotation device, and it shouldn't be treated like one. It gives you a visible marker and something to hold briefly if you need a pause. It isn't built or tested as life-saving equipment. Swim within your ability, respect posted conditions, and swim with others or under supervision whenever you can.
Worth a Second Look
Most swimmers inflate a tow float once, clip it on, and never think about it again beyond a pre-race valve check. Given how much it can tell you about hip position, stroke symmetry, and kick mechanics, it deserves a closer look. Pair it with a wetsuit built specifically for swimming, one that already supports your body position through its own buoyancy design, and you've got two pieces of equipment working on the same problem: keeping you horizontal, efficient, and aware of what your stroke is doing once you're past the buoy line.
If you're still sorting out which wetsuit gives you that foundation, Blue70's fitting guide walks through fit, feel, and body position before you ever get in open water.
