Compression Guide
This guide helps you understand the Daylong compression levels and how they translate to other compression classifications around the world.
Daylong Classification
Different manufacturers of compression hosiery work to different compression strength classifications. To help you avoid this confusion, we have created our own unified classification. We group products from all standards into five levels so you always find the widest range of options.
What is mmHg?
mmHg stands for 'millimetres of mercury,' a standard unit for measuring pressure. In compression hosiery, it indicates the level of pressure the garment applies to your leg. A higher mmHg number corresponds to a higher level of compression. It is crucial to choose the correct mmHg for your needs, and you should always consult a healthcare professional for guidance.
British Standard (UK)
The UK specification used by NHS prescriptions. Three classes from 14 mmHg up to 35 mmHg.
European Standard (RAL/EU)
The German-origin RAL standard widely used across Europe. Three classes from 18 mmHg up to 46 mmHg.
US Specification
Based on the RAL standard but with adjusted pressure ranges. Three classes from 15 mmHg up to 40 mmHg.
French Standard (AFNOR)
The French AFNOR specification. Three classes starting from a lighter 10 mmHg up to 36 mmHg.
Compression Level Chart
How each specification maps to Daylong's unified compression levels. Use the Compression Filter when shopping to see products from all matching standards.
| Daylong Level | EU / RAL | UK / BS | US | FR / AFNOR |
|---|---|---|---|---|
| Extra Light | — | — | — | — |
| Light | — | UK Class 1 14–17 mmHg | — | AFNOR Class 1 10–15 mmHg |
| Moderate | RAL Class 1 18–21 mmHg | UK Class 2 18–24 mmHg | US Class 1 15–20 mmHg | AFNOR Class 2 15–20 mmHg |
| Firm | RAL Class 2 23–32 mmHg | UK Class 3 25–35 mmHg | US Class 2 20–30 mmHg | AFNOR Class 3 20–36 mmHg |
| Extra Firm | RAL Class 3 34–46 mmHg | — | US Class 3 30–40 mmHg | — |
Compression Levels by Condition
Which compression levels are commonly associated with each condition. For moderate compression and above, always follow your prescriber's guidance.
| Condition | Extra Light<10 mmHg | Light10–18 mmHgUK 1 · AFNOR 1 | Moderate15–24 mmHgRAL 1 · UK 2 · US 1 · AFNOR 2 | Firm20–35 mmHgRAL 2 · UK 3 · US 2 · AFNOR 3 | Extra Firm>30 mmHgRAL 3 · US 3 |
|---|
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