A Complete Guide to Compression Sock Pressure Levels: 15-20, 20-30, and 30-40 mmHg Explained
If you've ever shopped for compression socks in Canada, you've likely come across terms like "20-30 mmHg" or "30-40 mmHg" on the packaging. These numbers aren't just marketing — they describe the amount of graduated pressure the sock applies to your leg, measured in millimetres of mercury (mmHg). Choosing the right pressure level is one of the most important steps in finding compression wear that works for your body and lifestyle.
This guide breaks down each compression level, who it's typically suited for, and what to keep in mind when browsing options.
What Does mmHg Mean in Compression Socks?
mmHg stands for millimetres of mercury — the same unit used to measure blood pressure. In compression socks, it describes the amount of pressure applied at the ankle, which gradually decreases up the leg. This graduated compression is what encourages blood to flow upward toward the heart rather than pooling in the lower limbs.
The higher the mmHg number, the firmer the compression. Different pressure levels serve different purposes, from mild everyday support to stronger therapeutic use.
15-20 mmHg: Mild Compression
The 15-20 mmHg range is the lightest therapeutic compression level available without a prescription in most Canadian provinces. These socks are designed for everyday comfort and preventive support.
Who typically wears 15-20 mmHg compression?
- People who stand or sit for extended periods (office workers, retail staff)
- Travellers on long flights or road trips
- Pregnant individuals looking for light swelling support
- Anyone seeking general leg fatigue relief at the end of the day
Browse 15-20 mmHg compression socks available at Factory Direct Medical, including options from SIGVARIS and JOBST — two of Canada's most trusted compression brands.
20-30 mmHg: Moderate Compression
The 20-30 mmHg range is the most commonly recommended therapeutic level in Canada. It provides meaningful circulatory support while remaining wearable for most people throughout the day.
Who typically wears 20-30 mmHg compression?
- Individuals managing mild to moderate varicose veins
- People recovering from leg or vein procedures
- Those with mild oedema (swelling) in the lower legs
- Athletes using compression for recovery after intense training
- Frequent flyers and long-distance travellers
The 20-30 mmHg compression collection at Factory Direct Medical includes styles for men and women across multiple fabric types — from breathable cotton to performance knits.
30-40 mmHg: Firm Compression
The 30-40 mmHg level delivers firm, medically significant graduated pressure. In Canada, healthcare providers often recommend this level for specific vascular or lymphatic conditions, and fitting guidance from a trained professional is typically advised.
Who typically wears 30-40 mmHg compression?
- People with more pronounced varicose veins
- Individuals managing chronic venous insufficiency (CVI)
- Those with deep vein thrombosis (DVT) risk factors, as directed by a healthcare provider
- Patients experiencing significant leg oedema or lymphoedema
Explore 30-40 mmHg compression stockings including options from SIGVARIS's Essential Cotton line — a trusted choice for firm therapeutic support across Canada.
Higher Levels: 40-50 mmHg and Above
Compression levels above 40 mmHg are considered prescription-only in most Canadian contexts. These are reserved for specific medical situations under direct healthcare provider supervision and are not typically available over-the-counter.
How to Choose the Right Compression Level
The right pressure level depends on your health history, lifestyle, and the specific conditions you're managing or preventing. Some factors to consider:
- Your activity level: Active individuals often tolerate higher compression levels more comfortably during use.
- Time on your feet: Longer periods of standing or sitting may benefit from a moderate rather than mild level.
- Specific health conditions: If you're managing a vascular or circulatory condition, consult your healthcare provider before selecting a level.
- Proper sizing: Compression is only effective when the sock fits correctly. Learn how to measure for compression socks to get the right fit.
Factory Direct Medical's team includes certified fitters at our Concord, Ontario showroom who can help match you with the right product. You can also call us toll-free at 1-855-235-2400 for guidance.
Frequently Asked Questions
Can I wear compression socks without a prescription in Canada?
Compression socks at 15-20 mmHg and 20-30 mmHg are generally available over the counter in Canada without a prescription. The 30-40 mmHg level may be purchased without a prescription but is often recommended with professional fitting guidance. Levels above 40 mmHg typically require a prescription.
What is the most commonly recommended compression level?
The 20-30 mmHg level is the most widely used therapeutic compression range. It provides meaningful circulatory support for a broad range of everyday and medical needs.
Are compression socks covered by insurance in Canada?
Coverage for compression stockings varies by province and private insurance plan. Many extended health benefit plans cover medical-grade compression garments when accompanied by a healthcare provider's recommendation. Check with your insurer for the specific terms of your plan.
Can I wear 30-40 mmHg socks all day?
Many people do wear 30-40 mmHg compression throughout the day, especially when managing specific conditions. However, the higher the compression level, the more important proper fit and donning technique become. If you're new to firm compression, it's worth speaking with a healthcare professional or certified fitter first.
Shop Compression Socks at Factory Direct Medical
Canada's trusted source for SIGVARIS, JOBST, and more — with free shipping on qualifying orders and certified fitters available in-store in Concord, Ontario.
