30–40 mmHg · Firm compression
Firm Compression Socks for Maximum Support
Designed for advanced circulation needs and more significant swelling — with strong, targeted support.
In Canada, compression socks may be eligible for insurance reimbursement, depending on your plan.
Is 30–40 mmHg right for you?
30–40 mmHg is the strongest level we offer, typically used for more advanced needs. If you're unsure, it's usually best to start with a lower level.
This may be right for you if:
Firm compression provides strong pressure and may not be suitable for everyone. If you're new to compression, we recommend starting lower unless advised by a healthcare provider.
What does "30–40 mmHg" mean?
Compression is measured in mmHg (millimeters of mercury) — how much pressure the sock applies to your leg, strongest at the ankle and easing up the calf (graduated compression). 30–40 mmHg is high compression — firm, targeted pressure for more advanced circulation and swelling needs.
Not sure which level? Compare them.
Surgeon-designed for real leg health
Dr. Johnny's compression wasn't designed by a marketing team. It was developed by Dr. Jean Segal — a surgeon with over 35 years treating patients with venous disease, swelling, and circulation problems. Every level we offer exists because his patients needed it: stylish enough to wear every day, effective enough to make a real difference.
Questions, answered
Do I need a prescription for 30–40 mmHg?
No prescription is required to buy, but 30–40 mmHg is firm — if you're new to compression, check with a healthcare provider first.
Are these covered by insurance in Canada?
Compression socks may be eligible for reimbursement under many extended-health plans in Canada, depending on your coverage. Keep your receipt and check with your provider.
How do I choose my size?
Sizes run S–XL based on shoe size and calf. Tap "View size guide" below — if you're between sizes, size up for comfort.
How does the Buy 2, Get 1 Free offer work?
Add any 3 single pairs to your cart and the discount applies automatically at checkout — no code needed.
What if they're not for me?
30-day returns. If they're not your favourite, we'll make it right.
Find your size
Measure around your ankle and the widest part of your calf, then match below.
| Size | Ankle | Calf | Shoe |
|---|---|---|---|
| S | 7–9" | 13–15.5" | W 5–7 |
| M | 7.5–10" | 14–17.5" | W 7.5–9.5 · M 6.5–8.5 |
| L | 8–10.5" | 15–18.5" | W 10–12 · M 9–11 |
| XL | 9–13" | 16–20" | W 12+ · M 11.5–14 |
If you're between sizes, size up. Ankle and calf measurements matter most for compression.
