Pace without lifting your head
Club swimming trains you to glance at the pace clock on the turn. Open water trains you to lift and sight. Both cost rhythm. A heads-up display puts the number in the lens so you keep swimming. FORM lists time, distance, pace, stroke rate, stroke count, calories, distance per stroke, and split times on the Smart Swim 2 and PRO pages. Heart rate joins that list on those two models. LT drops the heart-rate sensor and keeps the display.
The number does not make you honest. You can still sandbag a main set with a tiny 1:18 in the glass. What it stops is rolling onto your back to read a watch, or stopping at the flags because you lost count. If that is not your problem, keep the goggles you already like.
FORM calls the optics a patented waveguide. I care that the display can sit on the left or right eye, and that they say it stays visible for prescriptions up to −3. Past that you are in aftermarket lens territory. The display is the product. Everything else is whether you can still see it at 2,400 metres.
The 2026 lineup, checked 23 August
US dollars from formswim.com/pages/compare-goggles on 23 August 2026. UK pounds from the UK product pages the same day.
| Goggle | US / UK price | What you actually get |
|---|---|---|
| Smart Swim 2 LT | $149 / £129 | Heads-up display. No built-in heart rate. Same core metrics and SwimStraight as the others |
| Smart Swim 2 | $199 / £179 | The display plus an optical heart-rate sensor in the goggles. FORM’s “performance” middle |
| Smart Swim 2 PRO | $259 / £229 | Heart rate, Corning Gorilla Glass 3 inner and outer lenses, anti-fog spray instead of a factory coating |
| FINIS Smart Goggle | Not a new kit | Sunset end of 2025. Replacement frames only, Smart Coach not included |
LT is not a toy. It removes heart rate to cut the earstem hardware and the price. Smart Swim 2 puts the sensor back. PRO does not add more numbers. It changes the glass and how you fight fog. If you were about to pay extra for “more data,” stop. You already had the data on LT. Battery, from FORM support: up to 14 hours between charges on all three. Brightness eats that. About an hour to reach 80% from empty.
Heads-up display vs a watch you already own
This is where people overspend. If a Garmin or Apple Watch is already on the deck, you already have automatic metres and splits after the fact. Wrist hardware is a different purchase from a lens. I am not ranking watches here. For the logging and app job, use best swimming apps. Keep the watch. Ask only whether you need the number during the length.
FORM is honest on open water in a way the marketing headline is not. Onboard sensors capture heart rate, stroke rate, and time. GPS-powered distance and pace show in the goggles when you pair a Garmin or Apple Watch. No pair, no GPS pace per 100m in the lens. You can still swim on time and stroke rate. You cannot pretend the goggles grew a satellite.
In a pool the goggles count lengths with motion sensors. You set the pool size. You do not need the watch for distance in a 25m or 50m tank. Wear both if you like. Then pick one source of truth for the log, or you will argue about metres in the changing room. The lens is for the set. The written week is for March.
If you already glance at a watch between 100s and that is enough, these goggles are jewellery. The spend makes sense when looking at the wrist breaks the set, or when you keep losing the split because you will not stop. That is a swimming problem. It is not a shopping personality.
Fit leaks the number
I have watched people spend club-fee money on smart goggles and then swim with a drip in the right eye for forty minutes. They still praise the app in the car. The display was in a puddle. Fit is not a side quest.
FORM ships five interchangeable arched nose bridges, XS to XL, and a fully adjustable strap. Eye seals are replaceable. Try the bridges on dry land until the gasket sits without a death cinch. Then swim easy and check at 200 metres, not at the end of the main set. FORM’s own product-page replies say they work best when you push off the wall. They do not officially recommend diving or jumping in. If your warm-up is a racing dive every Tuesday, read that twice.
A hard seal around the socket is a common complaint. Some faces will hate these. FORM offers a 30-day in-water trial and a two-year warranty. Use the trial as a fit test. If they leak, send them back. A second nose bridge will not fix a face they were not built for.
Fog kills the display
A misted lens is a broken product. You cannot read 1:18 through soup. LT and Smart Swim 2 rely on a factory anti-fog coating. Coatings die faster if you rub the inside of the lens with a towel. PRO’s pitch is that you stop trusting the coating. Corning Gorilla Glass 3 on inner and outer lenses, plus a spray before each swim. FORM includes a bottle they rate at about 35 swims and a refill at about 140. The mix they print is 25% baby shampoo, 75% water. You can refill it at home.
That is extra faff, and the honest version of anti-fog: you spray every session, and you can clean the glass without destroying a coating. Four or five swims a week with bag grit, PRO is the one I would consider. Twice a week in a kind indoor pool, LT is enough glass. Stop wiping the inside of the lens either way. FORM’s current lenses are mirrored and they claim UPF 50+, blocking 98% of UV. Mirrored indoor can look dim in a badly lit club pool. If you cannot see the wall, you will not see the split either.
Do not spit-and-hope on PRO and then blame the glass. Do not use a bag as a lens case. Do not buy PRO because the word “Pro” sounds faster. The extra money is glass and spray. It is not a better split.
Open water still needs a watch
Lake and sea swimming is why a lot of triathletes stare at these. FORM’s open-water mode will show time and stroke rate from the goggles themselves. Distance and GPS pace per 100m in the lens need the paired watch. SwimStraight, listed as a core feature on the product pages and on the Premium comparison, is a patented in-goggle digital compass. It is a heading. It will not draw the shoreline, and it will not tell you that you swam 1,900 metres of a 1,500 metre loop because you bowed out. For that you still want GPS on the wrist. Pair before you get in. FORM lists Garmin and Apple Watch. If yours is neither, assume the GPS overlay is not coming.
FORM support says the goggles are approved by World Triathlon, USA Triathlon, PTO/T100, and supertri, and race-legal in half and full distance triathlon worldwide. The same article says they are not FINA approved. Check the meet info pack. Pool championships and triathlon are different policemen.
What Premium actually adds
The goggles work without a paid plan. Core, as listed on formswim.com/pages/premium: real-time metrics, tracking and analysis in the app, open-water mode, share to Strava, share to TrainingPeaks, SwimStraight. Premium is HeadCoach, in-goggle guided workouts from a library FORM puts at 1,500+, training plans, Script, a workout builder, TrainingPeaks and TriDot import. New goggles get a one-month Premium trial. After that the US shop lists $119 a year or $15 a month. Cancel and you keep the core metrics. You lose the in-lens workout sheet and HeadCoach.
If you already have a club coach and a whiteboard, you do not need HeadCoach arguing with the set. Importing a TrainingPeaks swim into the goggles is the Premium feature I would actually pay for, and only if you already live in that platform. The self-coached adult is the Premium customer. The age-grouper with a squad session is usually not.
SwimStraight is a compass in the lens. It is not GPS. Pair the watch if you need to know how far you have gone.
FINIS is not a buy in 2026
FINIS built a quieter corner-of-the-lens display. That product is over. On 17 December 2025 FINIS published an update on the FINIS Smart Goggle: sunset at the end of 2025, app still works for existing users, new devices had to be registered by 31 January 2026, replacement frames still sold while supplies last, Smart Coach not included. In August 2026 that is spare parts, not a shopping recommendation. If you already own a registered pair, keep swimming them until the module dies. Do not spend leftover-stock money on an unregistered unit. The window closed in January.
How to pick, without a personality quiz
Start with the head-down test. On your next main set, notice how often you actually need the split during the 100. If the answer is at the wall, on the clock, stop. If looking at your wrist wrecks the rhythm, keep going.
LT. Display, no heart rate. $149 or £129. The buy if you want the lens and you already wear a watch for pulse, or you do not train on heart-rate zones.
Smart Swim 2. Display plus optical heart rate in the goggles. $199 or £179. The buy if you want effort in the lens and you hate a chest strap. Temple sensors can glitch. FORM’s own reviews already say so.
PRO. Same data as Smart Swim 2, Gorilla Glass 3, spray-on anti-fog. $259 or £229. The buy if scratched lenses and dead coating are the real cost. It is not faster. It is clearer for longer if you do the spray.
Nose bridge on dry land. Easy 400 before you believe the trial. Pair the watch if you swim open water and you care about distance. Decide Premium after the free month, not at checkout. FORM’s 30-day in-water return is the fit insurance. Use it.
What you see mid-length is a training split, not a meet result. When the pad disagrees with the number you remember from the lens, the pad wins. For how those numbers work on paper, how to read splits. After you get out, the lens has done its shift. Write the session and last best so Tuesday is not a mystery in March. I would rather you write “8×100 on 1:40, held 1:18” than export seventeen FORM charts you never open.
Let the goggles run the set. Write the week after. If FORM and the watch disagree on metres, pick one and stop auditing the other in the car park. The useful argument is whether you hit the send-off, not which gadget won.
