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FIT KING FT-115A Review: Five Zones, No Cables, £400
By Paul Kendrick, Cardio & Endurance Editor · Updated 12 September 2026
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Compression boots stopped being professional kit somewhere around 2023, and the price collapse since has been dramatic. FIT KING's FT-115A costs £399.99 and does what a £900 system did three years ago: five sequential chambers per leg, no cable tethering you to a wall socket, pressure adjustable from 50 to 150 mmHg, and a touchscreen controller that fits in a carry bag. The interesting question is not whether cheap boots work now, because they do, but where the money still goes at the top end.
Having compared the specification against what the research actually supports, the FT-115A lands in a good place. The pressure range is wider than most rivals, the zone control is genuinely useful for anyone whose calves take more punishment than their thighs, and the cordless design removes the single biggest reason people stop using recovery kit: faff.
How we review
This review uses FIT KING's published specifications for the FT-115A, the peer reviewed evidence on intermittent pneumatic compression, and the repeated themes in verified owner reviews. We have not run a twelve month durability test on this unit, so claims about long term reliability are reported as owner consensus rather than our own findings. Where the Amazon listing and FIT KING's own site disagree, we have said which is which.
Who it is for
Runners in heavy training blocks get the most from these, particularly in the days after a long run when your legs feel like they belong to someone else. Cyclists stacking back to back rides, lifters doing high volume leg work, and anyone who stands for a living will all find a use for them. The cordless design means you can sit in an armchair rather than on the floor next to a plug, and that alone doubles how often most people use them.
They are not a good buy if you train twice a week, and they are not a treatment for a specific injury. If your legs hurt for a reason you cannot explain, see a physio before you buy a machine.
Check FIT KING FT-115A price on AmazonPros
- Five separate chambers covering foot, lower calf, upper calf, thigh and upper thigh
- Pressure adjustable across 11 steps from 50 to 150 mmHg, a wider range than most rivals offer
- Fully cordless, and it will run while charging if you forget to plug it in
- 2500mAh battery covers roughly a week of 30 minute daily sessions
- Zone targeting lets you run calves only, one leg only, or any combination
- Timer from 15 to 60 minutes in ten steps, so sessions end without you watching the clock
- Carry bag included, and the whole thing packs down small enough for a race weekend
Cons
- No heat function, which rivals at this price increasingly include
- One year warranty, short for a £399.99 device with a pump and a battery in it
- Amazon claims a 30% faster pump while FIT KING's own site says 45%, and neither figure is independently verified
- Zip closure has limited adjustment, so sizing mistakes are expensive to fix
- Pump noise is noticeable, roughly the level of a small air mattress inflator
- Sequential inflation is firm rather than smooth, and Normatec still feels more refined
Five zones and whether you need them
Four chamber boots inflate foot, calf, knee and thigh in sequence. FIT KING splits the calf into two, which sounds like marketing until you have run 20 miles and noticed that the pain lives in your lower calf and Achilles rather than spread evenly up the leg. Being able to focus two chambers there, or run calves alone and leave your quads out of it, is the practical benefit of the fifth zone.
The controller gives you three modes, single zone or multi zone operation, and single leg or both. Running one leg at a time halves the pump load, which makes the compression noticeably firmer, and it is the setting to use if you have one problem leg after a hard session.
Does the underlying method hold up? Reasonably well. A review of lower limb intermittent pneumatic compression for sports recovery found consistent benefits for perceived recovery and soreness, with more modest effects on hard performance markers, and a trial of intermittent pneumatic compression and DOMS in long distance runners reported reduced soreness after use. Your legs will feel better. Your 10k time will not drop because of a pair of boots.
| Model | FT-115A |
|---|---|
| Chambers per leg | 5 (foot, lower calf, upper calf, thigh, upper thigh) |
| Pressure range | 50 to 150 mmHg across 11 levels |
| Modes | 3, with single zone, multi zone, one leg or both |
| Timer | 15 to 60 minutes in 10 steps |
| Battery | 2500 mAh, approx 3 to 4 hours continuous |
| Charging | Rechargeable, usable while charging |
| Coverage | 360 degree wrap, zip closure |
| Heat | None |
| Sizes | Small, Medium, Large |
| Weight | Approx 4.5 kg packed |
| Warranty | 1 year |
Using them properly
Twenty to thirty minutes at 60 to 80 mmHg, legs raised slightly, most days in a heavy training block. That covers what the research supports and it is comfortable enough that you will keep doing it. The temptation with an 11 step pressure dial is to see how far up it goes; resist it, because higher pressure does not scale the benefit and it makes the session something you avoid.
Timing matters less than people think. Straight after a run is convenient and pleasant, while an evening session on a rest day is arguably more useful because it gets blood moving through legs that have been still all day. Our guide to using compression boots covers the protocol in more detail.
One safety point that deserves repeating. Compression boots push fluid up the leg, which is exactly what you do not want with an undiagnosed clot. If you have swelling in one leg with warmth, redness or pain that feels different from ordinary training soreness, read the NHS guidance on deep vein thrombosis and speak to a doctor before you strap anything on.
Value against the alternatives
FIT KING already sells the cheaper FT-115 style leg compression machine at around £220, which runs four zones off a mains powered pump. The FT-115A charges you roughly £180 more for the fifth zone, the battery and the touchscreen. Whether that is worth it comes down to one question: would a cable stop you using them? For a lot of people the honest answer is yes.
Against Normatec 3, the FIT KING is the value pick and Hyperice is still the better machine. Normatec's inflation is smoother, its app is more useful than it sounds, and its build has years of professional use behind it. You pay roughly double for that. If you are training seriously but not professionally, the FIT KING covers 85% of it.
See current FIT KING FT-115A priceFor a wider look at the category, including cheaper four zone options and what heat adds, see our best compression boots UK guide and the rest of our recovery section.
Recommended reads
Frequently asked questions
How do the FIT KING FT-115A compare with Normatec?
Close enough to matter at less than half the price. Both use sequential compression up the leg, both are cordless, and both let you isolate zones. Normatec's pressure delivery is smoother and its app adds session control, while FIT KING gives you a wider pressure range and a longer battery. If you are recovering from marathon training rather than being paid to run, the FIT KING does the job.
What pressure should you use in compression boots?
Start around 60 to 80 mmHg and stay there for your first fortnight. The full 150 mmHg on this unit is firmer than most people need and firmer than the pressures used in most of the published recovery research. Comfortable and repeatable beats maximum every time, since the benefit comes from doing it regularly rather than from gritting your teeth through one session.
Can you use them while they charge?
Yes, which is unusual in this category and genuinely useful. The 2500mAh battery gives roughly 3 to 4 hours of continuous running, so a 30 minute daily session gets you most of a week, but you can plug in mid session if you forget.
What size should I order?
Size by calf circumference and leg length, not shoe size. Medium suits most adults between roughly 5ft 4in and 6ft; taller runners or anyone with well developed calves should take Large. The zip closure has some give but not much, and a boot that will not close properly cannot seal, which kills the compression entirely.
Who should not use compression boots?
Anyone with a suspected or recent deep vein thrombosis, severe peripheral arterial disease, an active leg infection, an open wound, or uncontrolled heart failure should check with a doctor before using them. The NHS page on DVT is worth reading if you have leg pain with swelling and warmth rather than ordinary post training heaviness.
How long does it take to notice anything?
A single session leaves your legs feeling lighter within twenty minutes, and that part is immediate. The more meaningful effect on soreness and perceived recovery builds over a couple of weeks of regular use, which is also what FIT KING says in its own product notes.
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