Therafirm Knee High & Open-Toe Knee High Size Chart (20-30 / 30-40 mmHg)

Therafirm knee highs, closed & open toe, 20-30 & 30-40 mmHg

Tap any measurement below to see your full size details.

👆 Tap a value in the table to highlight your size.

Regular Calf

Measure	S	M	L	XL	XXL	XXXL	XXXXL
Ankle Circumference	16–18 cm6.25"–7.25"	19–22 cm7.5"–9"	22–25 cm9"–10"	25–29 cm10"–11.25"	29–32 cm11.25"–12.5"	32–35 cm12.5"–13.75"	35–38 cm13.75"–15"
Calf Circumference	27–33 cm10.5"–13"	29–36 cm11.5"–14"	32–38 cm12.5"–15"	34–41 cm13.5"–16"	37–43 cm14.5"–17"	42–52 cm16.5"–20.5"	51–61 cm20"–24"
Length	28–38 cm11"–15"	31–43 cm12"–17"	33–46 cm13"–18"	36–48 cm14"–19"	41–53 cm16"–21"	41–53 cm16"–21"	41–53 cm16"–21"

S

Ankle Circumference 16–18 cm6.25"–7.25"

Calf Circumference 27–33 cm10.5"–13"

Length 28–38 cm11"–15"

M

Ankle Circumference 19–22 cm7.5"–9"

Calf Circumference 29–36 cm11.5"–14"

Length 31–43 cm12"–17"

L

Ankle Circumference 22–25 cm9"–10"

Calf Circumference 32–38 cm12.5"–15"

Length 33–46 cm13"–18"

XL

Ankle Circumference 25–29 cm10"–11.25"

Calf Circumference 34–41 cm13.5"–16"

Length 36–48 cm14"–19"

XXL

Ankle Circumference 29–32 cm11.25"–12.5"

Calf Circumference 37–43 cm14.5"–17"

Length 41–53 cm16"–21"

XXXL

Ankle Circumference 32–35 cm12.5"–13.75"

Calf Circumference 42–52 cm16.5"–20.5"

Length 41–53 cm16"–21"

XXXXL

Ankle Circumference 35–38 cm13.75"–15"

Calf Circumference 51–61 cm20"–24"

Length 41–53 cm16"–21"

Full Calf

Measure	M	L	XL	XXL
Ankle Circumference	20–27 cm8"–10.5"	25–32 cm10"–12.5"	31–37 cm12"–14.5"	36–42 cm14"–16.5"
Calf Circumference	38–46 cm15"–18"	46–53 cm18"–21"	51–61 cm20"–24"	58–66 cm23"–26"
Length	31–43 cm12"–17"	33–46 cm13"–18"	36–48 cm14"–19"	41–53 cm16"–21"

M

Ankle Circumference 20–27 cm8"–10.5"

Calf Circumference 38–46 cm15"–18"

Length 31–43 cm12"–17"

L

Ankle Circumference 25–32 cm10"–12.5"

Calf Circumference 46–53 cm18"–21"

Length 33–46 cm13"–18"

XL

Ankle Circumference 31–37 cm12"–14.5"

Calf Circumference 51–61 cm20"–24"

Length 36–48 cm14"–19"

XXL

Ankle Circumference 36–42 cm14"–16.5"

Calf Circumference 58–66 cm23"–26"

Length 41–53 cm16"–21"

20-30 and 30-40 mmHg use the same chart; XXX-Large / XXXX-Large only in 20-30 mmHg.
Full Calf: Medium to XX-Large, Sand, 20-30 mmHg only (Thuasne full-calf knee high chart; not in the 2026 catalog).
Compression is the mean compression for an average ankle size.

Need help choosing your size? Our Certified Fitters are standing by. Mon–Fri 8am–7pm CST

📞 1-800-504-7315

Between sizes? Size down for a firmer therapeutic fit, or up for easier donning. It should feel snug — like a firm, even hug.

Wrong size? No problem. Easy exchanges — we’ll get you into the right fit.

Measure first thing in the morning, before swelling, with a soft tape measure held level. Applies to: Therafirm knee highs 20-30, 30-40 (incl. open toe). Step-by-step Measuring Guide →

Frequently Asked Questions

What makes Therafirm Support 20-30 mmHg Knee High Compression Stockings – Closed Toe different?

Therafirm Support 20-30 mmHg Knee High Compression Stockings – Closed Toe provide firm 20-30 mmHg graduated compression that is greatest at the ankle and decreases up the leg. Soft comfort band is non-restrictive while staying in place all day. Micro-Cool process wicks away moisture, providing a comfortable coolness.

What does 20-30 mmHg mean, and what does it help with?

20-30 mmHg is firm graduated compression: pressure is greatest at the ankle and decreases up the leg. In these knee high stockings, it may help relieve tired, heavy, aching legs and moderate swelling while graduated compression helps improve circulation. Talk to your doctor about whether 20-30 mmHg is right for you.

How do I know I’m ordering the right size?

Measure your ankle and widest calf area and check the garment length if the size chart requires it. Compare the results with the size chart for this exact product before choosing a variant. If you fall between sizes, use the brand’s fitting guidance rather than guessing.

How do I put these on and take them off?

Put the garment on when your legs are dry. Turn it inside out to the heel, guide your foot into place, and work the fabric gradually up the leg without pulling on the top band. Smooth out wrinkles; do not fold or roll the upper edge. To remove it, ease the fabric downward in stages. If gripping or applying the garment is difficult, consider donning and doffing aids, including application gloves and stocking donners.

How should I wash and care for this garment?

Hand wash in cool or lukewarm water with mild detergent. Gently squeeze out water rather than wringing the fabric. Lay flat, line dry or drip dry; avoid bleach, ironing and excessive heat. These instructions follow Therafirm’s garment-care guidance.

Overall rating: 4.2222223 / 5 from 9 reviews.

AI Generated Review Summary

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Review highlights

Reviews

Therafirm Unisex Closed toe knee high Stocking20-30

"Extremely difficult to get off over heel"

— Roxanne O. (4/5)

The best compression socks

"At first I was very surprised at how expensive these are. However after wearing them, they are well worth the price. The material is so comfortable and even in this heat they are amazingly comfortable. I had bought a pair at the drugstore thinking I was saving a lot of money but there is no comparison. The Therafirm is definitely worth the money."

— Irene D. (5/5)

Sorry, but I did not

"Sorry, but I did not give a final check of my order and it wound up arriving in size S and I need a size L. Will have to send the knee highs back and exchange them for size L."

— Diane V. (4/5)

NIL

"NIL"

— Govindarajan K. (3/5)

They are very tight ,

"They are very tight , hard to wear all day"

— Christine V. (3/5)

I haven't used them yet.

"I haven't used them yet. I usually have extra on hand"

— Pat C. (5/5)

I am happy.

"I have been useing these fo over 20 Years and they do what they are supposed to. Searted with a 2Xlarge and had to go to 4X this year but my leg does not swell. Good product, good price, and good delivery time. I am happy."

— Joseph (5/5)

See comments above.

"It was a struggle to put them on and the band at the top was very tight under my knee. Hopefully, after I wash them the top won't be so uncomfortably tight."

— Dorothy G. (5/5)