Why do I have to measure compression garments in the morning?

Compression works through graduated pressure — tighter at ankle, looser at thigh. The garment must be sized for your minimum swelling (morning) so it works as designed throughout the day. Sized to evening swelling = doesn't compress enough at minimum swelling.

What is mmHg compression pressure?

mmHg = millimeters of mercury. Standard compression levels: 15-20 mmHg (mild — travel, mild swelling), 20-30 mmHg (moderate — varicose veins, post-surgery, prevention), 30-40 mmHg (severe — DVT, chronic lymphedema), 40-50 mmHg (medical-grade, prescription-only). Always confirm with a doctor for medical use.

What's the difference between knee-high, thigh-high, and pantyhose compression?

Knee-high: covers ankle to just below knee. Most common, easiest to put on. Thigh-high: ankle to mid-thigh. Better for full-leg circulation issues. Pantyhose: ankle to waist. Best for both legs + abdomen circulation. Single-leg garments exist for unilateral lymphedema.

Are compression sleeves the same as compression socks?

Sleeves don't have a foot section — used for arm lymphedema, knee + calf compression for athletes. Socks include a foot section. Both use the same circumference-based sizing (ankle, calf, thigh, or wrist, forearm, bicep for arm sleeves).

Can I wear compression garments without a prescription?

Yes for 15-20 mmHg (mild) — sold OTC for travel, mild swelling, athletic recovery. 20-30 mmHg may need a prescription depending on country. 30-40+ mmHg almost always requires prescription. Brands like CEP, Comrad, Bombas Performance offer 15-20 mmHg without prescription.

How often should I replace compression garments?

3-6 months of daily wear. Spandex/elastane loses 30-50% elasticity in 4-6 months of daily use. When the garment feels noticeably less compressive, it's done. Cycle 2-3 garments alternately to extend life.

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How to measure May 22, 2026 5 min read

How to Measure for Compression Garments (Sleeves, Socks, Stockings)

Always morning, before swelling. Multiple circumferences. mmHg pressure matched to medical recommendation. Here's the precise technique.

The Morning Rule

Measure FIRST thing in the morning

Compression garments use graduated pressure (tighter at ankle, looser at thigh). They must be sized for your minimum swelling (morning) to work correctly through the day. Evening measurements = wrong size = wrong compression.

Leg Compression Measurements

Measurement	Where	When
Ankle	Narrowest point above ankle bone	Morning
Calf	Widest, relaxed standing	Morning
Thigh (thigh-high+)	Widest near groin	Morning
Length	Floor to top (knee-high / thigh-high / waist)	Morning

Compression Pressure (mmHg)

Pressure	Use case	Prescription?
15-20 mmHg	Travel, mild swelling, athletic recovery	OTC
20-30 mmHg	Varicose veins, post-surgery, prevention	Sometimes
30-40 mmHg	DVT, chronic lymphedema, severe varicose	Yes
40-50 mmHg	Medical-grade, severe lymphedema	Yes
50+ mmHg	Specialty medical only	Yes

Always confirm prescription level with your doctor. Wrong-pressure compression can be dangerous (too tight = circulation cutoff; too loose = no benefit).

Arm Compression (Lymphedema, Sleeves)

Measurement	Where
Wrist	Just below the wrist bone
Forearm	Widest part
Bicep	Widest part of upper arm, relaxed
Length	Wrist to underarm or shoulder (varies by garment)

Common Mistakes

Measuring evening = wrong size

Always morning, before swelling.

Sizing up because compression feels tight

Tight is correct. Sizing up = no compression.

Wearing same compression for years

Replace every 3-6 months of daily wear.

Mixing OTC and prescription pressures

Wrong pressure can be dangerous. Always confirm with a doctor.

FAQs

Why measure compression in morning?

Minimum swelling = correct base for graduated pressure.

What is mmHg?

Pressure rating. 15-20 mild, 20-30 moderate, 30+ severe.

Knee-high vs thigh-high vs pantyhose?

Coverage difference. Pick by medical need.

Sleeves vs socks?

Sleeves don't have a foot. Same sizing logic.

Need prescription?

Yes for 30+ mmHg. 15-20 OTC.

How often replace?

3-6 months of daily wear.

Morning, Multiple Points, Right Pressure

For ankle/leg-specific measurements see ankle measurement guide, calf guide.

Selling compression on Shopify? Multiple-circumference matching.

Tailor Size Guide adds ankle + calf + thigh + mmHg matching to every compression listing.

Install the Shopify app Read the docs