How to Choose the Right Compression Level — Complete Guide
Walk into any compression wear section and you'll see numbers like 15–20 mmHg or 20–30 mmHg on the packaging. Most women have no idea what these mean — or whether they're buying the right level for their needs.
This guide explains everything clearly. By the end, you'll know exactly which compression level is right for you — and why it matters.
What Does mmHg Mean?
mmHg stands for millimetres of mercury — the same unit used to measure blood pressure. In compression wear, it describes how much pressure the garment applies to your limbs.
The higher the mmHg number, the firmer the compression. But more isn't always better — the right level depends entirely on why you're wearing compression and what you're trying to achieve.
Compression Levels Explained
| Level | mmHg Range | Who It's For | Daily Feel |
|---|---|---|---|
| Mild / Travel | 8–15 mmHg | Light fatigue, occasional travel, first-time wearers | Barely noticeable — like a gentle hug |
| Moderate | 15–20 mmHg | Flight attendants, nurses, retail workers, pregnancy | Gentle but noticeable squeeze |
| Firm | 20–30 mmHg | Varicose veins, heavy swelling, post-surgery | Clear pressure — takes getting used to |
| Extra Firm | 30–40 mmHg | Lymphedema, severe venous insufficiency | Strong — requires professional fitting |
| Medical Grade | 40+ mmHg | Prescribed by doctors only | Prescription required |
Buying a European brand labelled CCL or Class? Our compression class converter shows what each class equals in US mmHg.
Which Level Is Right for You?
Use this simple guide to find your starting point:
You're a flight attendant or travel frequently: Start with 15–20 mmHg. This level prevents altitude-related swelling on long-haul flights and is comfortable enough for a full 12-hour shift.
You work on your feet all day (nurse, retail, teacher): 15–20 mmHg is ideal. Provides meaningful support without feeling restrictive during active work.
You're pregnant or postpartum: 15–20 mmHg for most women. Always check with your midwife or doctor — some situations call for 20–30 mmHg.
You have varicose veins or heavy leg swelling: Start with 20–30 mmHg. Clinical guidelines commonly recommend this level for varicose veins, to help slow progression and relieve associated symptoms.
You've been diagnosed with lymphedema: 20–40 mmHg depending on severity. Always follow your doctor's specific guidance.
You're new to compression and unsure: Start with 15–20 mmHg — it's the most versatile level and works well for most everyday needs.
Common Mistakes When Choosing Compression
Buying too high a level thinking more is better — very firm compression (30+ mmHg) can be uncomfortable and even counterproductive if you don't need it.
Ignoring the mmHg rating entirely — products that say 'compression' without specifying mmHg may provide minimal therapeutic benefit.
Choosing the wrong size — compression only works when the garment fits correctly. Always check the brand's size chart using your measurements, not your usual clothing size.
Wearing compression to bed — for most people, compression during sleep is unnecessary and can restrict circulation. Remove before sleeping.
Stay informed
Research-based reviews, comparisons, and buying guides — delivered to your inbox.
Compression for Specific Professions
| Profession | Recommended Level | Key Need | Top Pick |
|---|---|---|---|
| Flight attendant | 15–20 mmHg | Altitude swelling prevention | VIM & VIGR Footless Tights |
| Nurse / doctor | 15–20 mmHg | All-day fatigue relief | Comrad Compression Socks |
| Retail worker | 15–20 mmHg | Standing fatigue | Comrad or VIM & VIGR |
| Teacher | 8–15 mmHg | Light daily support | Any quality 15 mmHg option |
| Pregnant woman | 15–20 mmHg | Ankle and leg oedema | Consult midwife first |
| Post-surgery | 20–30 mmHg | Recovery support | Consult surgeon first |
How to Get the Most from Your Compression Wear
Put it on first thing in the morning — before swelling has a chance to develop. Compression is preventive, not just reactive.
Check the fit regularly — compression garments lose elasticity over time. Replace every 3–6 months with daily wear.
Wash correctly — hand wash or gentle machine cycle, cold water, never tumble dry. Heat destroys the elastic fibres that provide compression.
Size up if between sizes — slightly looser is better than too tight, which can restrict circulation.
Our Recommended Products by Level
VIM & VIGR Nylon Footless Compression Tights (15–20 mmHg)
Class 1 graduated compression in a footless nylon tight, covering ankle to waist. The footless cut lets you wear your own socks or knee-highs and keeps shoe fit unchanged.
Best for: 15-20 mmHg daily wear, flight attendants, professionals
Pros
- ✓ 15–20 mmHg graduated compression
- ✓ Full-leg coverage from ankle to waist
- ✓ Footless: pairs with your own socks or hosiery
Cons
- ✗ Footless edge shows at the ankle with open shoes or skirts unless layered
- ✗ Size by ankle and calf measurement, not dress size
Comrad Compression Socks — 15–20 mmHg
Medical-grade moderate compression in a professional sock design. Perfect for healthcare workers and anyone on their feet all day.
Best for: 15-20 mmHg, healthcare workers, daily wear
Pros
- ✓ Certified 15-20 mmHg
- ✓ Comfortable all-day wear
- ✓ Professional designs
- ✓ Great value
Cons
- ✗ Ankle and calf only
- ✗ Not full-leg coverage
Frequently Asked Questions
Can I wear 20–30 mmHg without a doctor's recommendation?
For most healthy adults, 20–30 mmHg compression is available without a prescription and is safe for everyday use. However, if you have circulation problems, diabetes, or heart conditions, consult your doctor first.
How do I know if my compression is working?
Your legs should feel noticeably lighter and less tired at the end of the day. Visible swelling should reduce. If you feel numbness, tingling, or increased pain — the compression may be too tight or the wrong size.
Can I wear compression leggings during exercise?
Yes — 15–20 mmHg is well suited to exercise and can improve performance and reduce muscle fatigue. Many athletes use compression specifically for post-workout recovery.
Do I need different compression for different activities?
Not necessarily. 15–20 mmHg is versatile enough for most activities — travel, work, exercise, and recovery. You only need to consider higher levels for specific medical conditions.
Now that you know your compression level, find the right product for your profession.
Shop by Profession