Compression hosiery applies graduated pressure, tightest at the ankle and easing upward, to support circulation.
also: compression stockings, compression socks, support hosiery
The basics
What to know about hosiery & socks
Sorted by height and thickness
Hosiery and socks are knitted leg coverings sorted by two things: how far up the leg they reach, and how much skin they hide. Height runs from a no-show sock hidden inside a loafer to a waist-to-toe piece covering you from the navel down. Opacity is the second axis, spanning nearly invisible to a solid block of color. Six shapes fill that grid here. Sheer Pantyhose and Tights both cover waist to toe and differ only in yarn weight. Leggings stop at the ankle with no foot. Socks end somewhere between the shoe line and mid calf. Knee-Highs and Trouser Socks finish below the kneecap, and Boot Liners reach the knee to live inside a boot shaft.
Knitted as one tube
Almost everything here comes off a circular knitting machine as one continuous tube. A pair of tights has no seam down the side. Denier ranks those tubes: it counts the weight in grams of 9,000 meters of the yarn, so a higher figure means thicker yarn, more opacity and more resistance to tearing. Five to 15 denier reads as barely there, 20 still looks sheer while surviving repeat wearing, 40 to 60 turns semi-opaque. 80 and above becomes a solid color. Nylon supplies the strength and 5 to 20 percent elastane, the stretch fiber also sold as spandex, supplies the recovery. Because one uninterrupted yarn builds the whole tube, a single cut loop unravels in a line, which is a run. Socks work by different rules below the ankle, where a shaped heel pocket, a ribbed cuff and a flat toe seam decide whether a pair stays up and stops rubbing. Leggings leave the system entirely, since they are cut and sewn from knit yardage and are judged in grams per square meter instead.
Pick by the shoe and the hemline
Pick by the shoe and the hemline rather than by the outfit. A dress code that treats bare legs as underdressed argues for Sheer Pantyhose in 10 to 20 denier. January in a skirt calls for Tights at 80 denier or more, which insulate roughly as well as a thin pair of trousers. Under office trousers with closed shoes, Knee-Highs and Trouser Socks give coverage that stops where the fabric does, with far less on the body than full pantyhose. Reach for no-show Socks with a silicone grip strip inside the heel when the shoe is a loafer or a low-cut sneaker. Tall rubber and riding boots take Boot Liners, because unlined rubber draws heat straight out of your calf. Leggings suit ankle boots under a long top or dress, where the hem finishes at the boot line and no foot seam sits inside your shoe.
What you pay for invisibility
Thin is what you pay for invisibility. A 10 denier leg looks like skin and can be finished in an hour by a chipped nail, rough heel skin or a car door latch. Nothing halts a run once the yarn is cut. Weight costs you the opposite way. An 80 denier knit holds heat and humidity against your legs, so anyone who overheats will regret it in a warm office. Cotton feels better against skin than nylon and recovers worse, which is why cotton-rich tights and leggings bag at the knee by evening. Merino socks stay dry and can be worn twice, at two or three times the price of a synthetic pair that smells by lunchtime. Compression socks sit apart from all of this, graded in millimeters of mercury rather than denier, so ask a doctor which grade to wear if you have circulation problems, diabetes or leg swelling.
Turn a pair inside out
Turn a pair inside out before you spend anything. On waist-to-toe pieces, look for a gusset, the small diamond panel where the two legs meet, cut wide and in cotton, since a narrow one drops the crotch seam into a single pressure line by mid afternoon. Waistbands want to be flat and at least an inch and a half deep, because a narrow band of bare elastic rolls down before lunch. Socks hide their quality in the toe seam, where a hand-linked or flat join sits invisible under your toes while a bulky overlocked ridge rubs on a long walk. Stretch any cuff or band and let go, then reject anything that does not snap back. Size waist-to-toe pieces by height first and weight second, as length is what drags the crotch down.
Heat kills all of it
Heat is what kills all of it. Dryer heat and hot water cook elastane, and slack elastane is what leaves sagging knees and loose ankles, so wash cool and inside out in a mesh bag, then dry flat or on a hanger. Skip fabric softener, which coats elastane and shortens its life while flattening the cushioning loops on a sock sole. File rough heel skin and keep toenails short, because your own feet snag more hosiery than furniture ever does. Merino wants cool water and no dryer heat at all, since heat felts the fiber and can shrink a sock a full size in one cycle. Rotate three or four pairs instead of wearing one favorite, as elastane recovers over about a day of rest.
Buyer checklist
Before you buy hosiery & socks
Comfort depends on accurate measurements, soft contact points and care that suits how often the item will be worn.
01
Measure regularly
Band, cup, waist and hip measurements can change. Use the maker's current chart rather than relying on an old label.
02
Check every contact point
Bands, wires, elastic, seams, straps and closures should sit without digging, rolling or rubbing.
03
Read the fiber blend
Cotton, modal, lace, microfiber and elastane differ in breathability, stretch and drying time.
04
Follow care instructions
Heat and aggressive washing shorten elastic life. Consider how much special care is realistic for you.
Pull waist-to-toe hosiery on and squat once. The gusset should stay within an inch of your body at the lowest point. A crotch seam that drops toward your knees means the leg is too short whatever the waist measurement says.
Size from the maker's height and weight grid rather than a dress size, and take the larger box when you land between two. Lower tension on the yarn directly buys extra wearings.
Check leggings for opacity the way you will wear them: put them on, bend forward and look in a mirror, because the knit thins across the seat under stretch and a standing mirror check hides that.
Sit down in knee-highs and cross your legs. The band should land below the crease behind your knee, and a deep red ring on your calf after an hour means the band is too tight to keep.
Buy socks so your shoe size sits in the middle of the printed range instead of at the top, since a sock one range too big puts the heel pocket behind your heel and the sock then slides.
Try boot liners inside the actual boot and wiggle your toes. Toes that cannot move mean the boot is now too tight, and a tight boot runs colder than a bare one.
Care
Caring for hosiery & socks
Wash cool and inside out in a mesh bag, and keep every piece here out of the dryer, because heat destroys elastane and slack elastane is what leaves sagging knees and loose ankles.
Skip fabric softener. It coats elastane and shortens its working life, and on a cushioned sock sole it flattens the very loops doing the padding.
File rough heel skin and keep toenails short and smooth, since your own feet snag sheer hosiery more often than furniture does.
Give merino cool water and a flat dry with no dryer heat at all, which felts the fiber and can shrink a sock a full size in a single cycle.
Rotate three or four pairs instead of wearing one favorite, as elastane recovers over roughly a day of rest and a pair worn daily goes slack far sooner.
Air boot liners outside the boot overnight, because a damp liner left inside a closed shaft grows odor within a few days.
Questions
Common questions
What does denier actually measure?
Denier counts the weight in grams of 9,000 meters of yarn, so it describes yarn thickness rather than the finished garment. Opacity tracks it closely: 5 to 15 denier is barely there, 20 stays sheer but lasts longer, 40 to 60 goes semi-opaque, and 80 and up reads as a solid color. Durability climbs with the same number.
Can anything stop a run once it starts?
No. A run is one cut loop unravelling along the single continuous yarn the whole tube was knitted from, so the damage keeps travelling. Clear nail polish or hairspray dabbed at both ends slows it enough to finish an evening, and that is the limit. Prevention works better: short toenails, filed heels and a size up.
How do I choose when the size chart puts me between two sizes?
Take the larger one. Charts for waist-to-toe hosiery cross height against weight, and height matters more, because a leg cut too short drags the crotch seam down and puts the whole knit under tension. Sizing up lowers that tension and adds wearings. Going too large shows only as slight bagging at the ankle, which is the cheaper mistake.
Why do my socks keep sliding down?
Three causes cover nearly all of it. The cuff has lost its elastane, which follows dryer heat or about a year of wear. The sock is sized above your shoe range so the heel pocket sits behind your heel; or it is a no-show with no silicone grip strip inside the heel. Stretch the cuff and watch it. No snap back means replace the pair.
Cotton, merino or synthetic for everyday socks?
Cotton absorbs sweat and holds onto it, so cotton socks feel damp by late afternoon and cold inside a wet boot. Merino wool takes moisture into the fiber and still feels dry, resists odor across two wearings and costs two to three times more. Synthetic blends move sweat out fastest and hold smell, which suits gym use where you wash after every wear.
Is it worth wearing tights under trousers in winter?
Yes for warmth, with one condition: the knit has to be smooth. An 80 denier pair adds insulation close to a second layer of trousers and slides against a lining instead of catching on it. Fleece-lined pairs are warmer and bunch at the ankle inside a trouser leg. Avoid cotton-rich tights here, since they bag at the knee under a second layer.
Are compression socks just tight knee-highs?
No. Graduated compression is graded in millimeters of mercury, often 15 to 20 for travel and higher grades a clinician selects, and the pressure eases as the sock climbs the leg. The height matches a knee-high and the purpose does not. Ask a doctor which grade suits you if you have circulation problems, diabetes or leg swelling.
How long should a pair last before it stops fitting?
Elastane ages first, going slack from heat and constant stretch rather than wearing through. Sheer pantyhose worn weekly often see out a season. Opaque tights and leggings worn twice a week usually lose their shape inside a year whatever they cost. Sock cuffs give the clearest signal: once one no longer snaps back, the pair is done even if the knit looks fine.
