Compression boots are inflatable leg sleeves. A pump inflates air chambers in each boot, then lets the air out, in repeating cycles[1]. Many boots fill one zone at a time, from the foot upwards. You choose how firm the squeeze is (in mmHg), the pattern (the mode) and how long the session runs (the timer).
- Air chambers, grouped into zones, fill and empty in repeating cycles, often from the foot towards the thigh.
- Zones, modes, pressure levels and the timer are four different settings: where, what pattern, how firmly and how long.
- Pressure is a comfort setting, not a score. Start low and increase gradually.
- Settings and sizing differ from brand to brand, so read the user manual before your first session.
This guide opens the Compression guide in Learn: the parts, one cycle step by step, the settings and what a session feels like.
What's inside a compression boot?
A compression boot is a simple machine: a sleeve with air pockets, a pump and a few controls. Researchers describe the method as pumped inflation and deflation cycles of air bladders, usually applied to the legs[1]. Here's what each part does:
- Air chambers are sealed pockets in the boot that fill with air and empty again.
- Zones are groups of chambers covering one part of the leg, such as the foot and ankle, calf, knee or thigh. Brands count zones and chambers differently, so check which one a spec sheet means.
- A pump and controls move the air and run the pattern, pressure level and timer you pick.
- A closure, often a zip, holds the boot close to your leg before it inflates.
You'll also see the terms air compression and sequential compression.
In short, compression boots squeeze and release your legs in a repeating pattern, often from the feet up.
One cycle, step by step
On a typical foot-to-thigh pattern, one cycle looks like this:
- Fill. The chambers at the foot inflate first.
- Travel. The next zone up fills, then the next, so the pressure moves up the leg like a slow wave.
- Hold. The pressure stays at your chosen level for a moment.
- Release. The air is let out and the boot softens.
- Repeat. The cycle starts again until the timer ends the session.
Not every boot releases the same way. Studies describe a sequential program, where chambers inflate and deflate one at a time, and a peristaltic program, where chambers fill one at a time, hold, then all deflate together[1]. Modes on consumer boots are preset patterns, and what each one does varies by model, so check the user manual.
Zones, modes, pressure and timer: four different settings
Spec sheets often run these numbers together, but each answers a different question, and a higher top pressure isn't something to aim for.
| Setting | The question it answers | What it means | On RecLegs |
|---|---|---|---|
| Compression zones | Where does it squeeze? | Areas of the leg that fill separately | 4 per leg: foot & ankle, calf, knee, thigh |
| Modes | How does the wave move? | Preset patterns of filling, holding and releasing | 5 modes |
| Pressure level | How firm is the squeeze? | The air pressure the chambers inflate to, in mmHg | 7 levels: 30, 50, 80, 120, 160, 200 and 240 mmHg |
| Timer | How long does the session run? | Session length, then the boots stop | 15, 30 or 45 minutes, with automatic shut-off |
Two more RecLegs specs sit outside those settings: independent left and right, and rechargeable cordless use (battery-powered during use, charging by USB-C).
What does mmHg mean?
mmHg (millimetres of mercury) is a standard unit of pressure. On a compression boot it names the level you set, not a measurement taken from your body, and how firm a level feels also depends on how the boot fits. Studies have used a wide spread of pressures[1], so there's no "right" number to copy: start low and increase gradually.
What does it feel like?
On a foot-to-thigh pattern, you feel a firm, rhythmic squeeze that starts at the feet and moves up the legs, a short hold, then a release before the next wave. The main sensation is pressure, not the percussion of a massage gun.
A first session can feel tighter than you expect. If it feels uncomfortable, check your size, lower the pressure level and follow the user manual. Our compression boots size guide explains how to measure from your heel to the top of your thigh, and how to use compression boots walks through a first session.
Boots cover a lot of skin, so they can feel warm. Comfort matters, especially in an Australian summer.
Quick answers
Do compression boots inflate all at once?
Not always. Inflation cycles can run uniformly, with every chamber at once, or in sequence[1]. Many boots fill in sequence, one zone at a time from the foot, and depending on the mode the chambers then release one by one or all together[1]. The user manual explains what each mode does.
Is a higher pressure level better?
No. The level is a comfort setting, not a score, and studies have used a wide range of pressures[1]. Start at the lowest level and increase gradually. If you feel pain, numbness or tingling, stop and seek medical advice.
Do compression boots need to be plugged in?
Not always. Some systems are used plugged into the wall; others run on a rechargeable battery during the session. RecLegs offers rechargeable cordless use, charging by USB-C.
Sources
1 source
- Maia F, Nakamura FY, Sarmento H, Marcelino R, Ribeiro J. Effects of lower-limb intermittent pneumatic compression on sports recovery: a systematic review and meta-analysis. Biology of Sport. 2024;41(4):263–275. Cited here only to describe the method and the programs and pressure ranges used in studies, not for any result. Funding: Portugal's Foundation for Science and Technology (FCT); the authors declare no conflicting interests. pmc.ncbi.nlm.nih.gov/articles/PMC11475002