Buying
How to choose mmHg (compression level)
Updated 2026-09-08 · 7 min read · All guides
General information only — not medical advice. If you are unsure whether compression is suitable, ask a clinician first.
What mmHg means
mmHg (millimetres of mercury) describes how much pressure a sock is designed to apply. Higher numbers mean firmer compression. Ranges on consumer packs are often approximate and brand-specific.
Common consumer ranges (illustrative)
- Around 8–15 mmHg — light / everyday comfort for many people
- Around 15–20 mmHg — moderate; often marketed for travel and all-day wear
- Around 20–30 mmHg — firmer; sometimes used under clinician advice
- Higher than ~30 mmHg — typically medical territory; do not self-prescribe
These bands are a rough map, not a prescription. If you have a health condition, ask a professional before buying firmer classes.
Choosing without the hype
- Start with why you want them (travel, sport, standing work)
- Prioritise a size chart over "one size" claims
- Prefer clear mmHg labelling over vague "firm support" wording
- If pregnant, or if you have vascular or nerve issues, get personal advice first
Fabric and build
Look for durable knit, a comfortable toe and heel, and a cuff that stays up without digging. Moisture-wicking fabrics help for sport; opaque or sheer styles are preference for workwear.