A Field Guide to Vests: Singlet to Base Layer
Sleeveless, crew neck, V-neck, ribbed, waffle, merino, string. What every type of vest is actually for, which one goes under a suit, and what to buy first.
The Best Vests and Undershirts You Can Actually Buy
The best men's vests and undershirts, sorted by job: singlet, fine rib, deep scoop, merino base layer and technical sweat vest, with who should skip each one.
Some links on this page are affiliate links. If you buy through one we may earn a small commission, at no extra cost to you. It never changes what we recommend. More on how this works.
A man takes off his shirt at the end of a summer day and hands it to somebody who will wash it. On the collar and under the arms there is nothing at all, because a thin layer of cotton spent the day between his skin and the shirt and took everything the shirt would otherwise have taken. The shirt will last years. The vest will last years. Nobody involved thinks about it again.
This is a garment that gets laughed at in exactly one country's worth of media and worn without comment everywhere else. In Italy the canottiera is simply what you have on under the shirt. In Germany the Unterhemd is sold in the same aisle as everything else. In France the marcel has been so thoroughly rehabilitated that it is now sold as outerwear. The English-speaking joke is a local and fairly recent one, it is based on a costume decision in a small number of films, and it has cost a lot of men a genuinely useful piece of clothing The Vest Is the Obvious Choice.
The useful thing to understand is that "vest" is not one garment. It is five, they do different jobs, and buying the wrong one is most of the reason people conclude that vests are not for them.
What the garment is actually doing
Three jobs, in order of how much they matter.
The first is moisture management. Sweat leaves your skin, hits an absorbent layer, and either stays there or moves outward. A vest gives it somewhere to go that is not your shirt, which is why shirts worn over vests stay dry at the underarm and outlast shirts worn against skin.
The second is friction. A shirt against bare skin drags, sticks and rubs, particularly under a jacket on a warm day. A smooth knit between the two lets the shirt move independently, which is why tailors have recommended undershirts under suits for as long as there have been suits Briefs for the Office: The Tailoring Argument.
The third is insulation, the one everybody assumes is the only one. In winter that is the point. In summer, a thin vest can genuinely make you cooler by moving sweat off the skin faster than still air would.
Three jobs, three different fabrics, and that is the whole map of the category.
The singlet, and what sleeveless is actually for
The sleeveless vest is the oldest form and the one that gets the most abuse, which is a shame because it is the most specifically useful of the lot.
Its point is coverage of the torso without coverage of the underarm. In genuine heat that is a strength: the chest and back layer stays intact while the underarm breathes directly into the shirt. It is also the correct thing under a rugby shirt, under overalls, under anything with a rough interior.
Sunspel, knitting in Nottinghamshire since 1860, makes the version that converts people. Long staple cotton, fine gauge, light enough to be invisible under a shirt and dense enough to hold its shape at the shoulder strap, which is where cheap singlets fail first.
Its weakness is that fine cotton is not a hard wearing fabric. This is a garment for a shirt and a desk, not for a shift on a site The Working Man's Brief: Underwear for the Site, the Van and the Ten-Hour Shift.
Merz b. Schwanen is the enthusiast's answer. Founded in 1911 in Albstadt, revived in 2011 when a couple found the abandoned factory and its late nineteenth century loopwheel machines and spent a year restoring them. Loopwheeled jersey is knitted at roughly a metre an hour with no tension in the fabric, and it produces a softness that is genuinely difficult to describe and immediately obvious to wear.
The weakness is that loopwheeled cotton is heavy, it shrinks on the first wash in a way you need to plan for, and it is the least invisible option here. This is a vest you buy because you like fabric, not because you want it to disappear.
Merz b. Schwanen loopwheeled singlet
The fine rib vest, which is the classic for good reasons
If there is an archetype, it is the German fine rib. Schiesser has been making it in Radolfzell since 1875, in both Feinripp, the fine rib, and Doppelripp, the heavier double rib, and half of central Europe grew up in one or the other.
Rib is textile engineering rather than a texture. Alternating columns of face and reverse stitches let the fabric stretch and recover sideways without much elastane, so the garment holds its shape through hundreds of washes, breathes through the channels between the ribs, and lies flat rather than clinging. It is the same structure that makes a good cotton brief last The Fabric Bible: What Your Briefs Are Actually Made Of.
Its weakness is visual. Rib shows through a thin shirt in a way plain jersey does not, and the vertical lines are visible at the neckline of anything worn open. The double rib is a winter garment under an opaque shirt, not a summer one under poplin.
Hanro of Liestal, making underwear since 1884, is the version for people who want the same reliability with a smoother face. The mercerised cottons have a subtle lustre, the shoulder seams are set properly rather than overlocked flat, and the fit is cut for a body rather than for a size chart Hanro cotton undershirt.
The weakness is that Hanro's cotton is finer than Schiesser's and correspondingly less robust, and the fit runs closer, which some men find is exactly right and others find is a size too small.
The deep scoop, for the shirt worn open
Here is the problem the deep scoop exists to solve, and it is the single commonest complaint about undershirts: you wear one under an open collar shirt, you undo the top button, and there it is. A white crescent of cotton sitting in the gap, announcing itself.
The fix is a neckline cut low enough to sit below the point where the shirt opens. A deep scoop, sometimes sold as a low scoop or a deep V, drops the front neckline several centimetres below a standard crew, which puts it out of sight under a shirt worn with one or even two buttons undone The Undershirt Under a Dress Shirt: Six Rules.
Uniqlo's AIRism range, developed with the Japanese fibre company Toray, is the mass market answer and a genuinely good one. A fine synthetic knit that moves moisture fast, dries faster, and is thin enough to be invisible under all but the sheerest shirt. The deep neck versions exist precisely for this job, and they cost a fraction of anything Swiss.
The weaknesses are the usual synthetic ones. It holds odour after a hard day in a way cotton does not, it feels slightly cool and slick against the skin in a way not everyone likes, and it is not a garment that lasts a decade The Sweat Article: Moisture-Wicking Fabrics, Explained Properly.
Uniqlo AIRism deep neck undershirt
Two rules make the deep scoop work. Buy it in a shade close to your own skin tone rather than white. And check the neckline depth against the shirt you actually wear open, in a mirror, before buying five.
The merino base layer
Wool against the skin sounds like a Victorian punishment and is in fact the best sweat management fabric that exists, because merino is fine enough not to prickle and because wool moves moisture as vapour before it ever becomes liquid.
The practical consequence is odour. A merino base layer worn for three days on a walking trip does not smell, which is a property of the fibre's structure and the reason every long distance walker owns one The Best Merino Underwear.
Icebreaker, founded in New Zealand in 1995, is the most available and the softest, with the finest yarn of the mainstream merino brands. Buy it as your first one merino base layer vest.
Its weakness is durability. The very fine lightweight versions wear at the shoulder strap and under a rucksack belt sooner than the price suggests they should, and a blend with a little nylon lasts considerably longer than a pure one.
Icebreaker merino base layer vest
Woolpower, knitting in Östersund in Sweden, is the cold weather specialist. The Ullfrotté Original fabric is a terry loop knit with the loops facing inwards, trapping air against the skin, and nothing else here is warmer for its weight The Winter Base Layer: How to Be Warm Without Looking Like a Bin Bag.
Its weakness is that it is unambiguously a winter garment, it is bulky under a shirt, and worn indoors it will make you miserable.
Woolpower terry loop base layer
The technical sweat vest
A separate category from the merino base layer, and worth understanding as its own thing: garments engineered specifically to stop sweat reaching the outer shirt.
The mainstream version is a close fitting synthetic with mesh panels under the arm and across the back, of which Under Armour's HeatGear is the best known. It works, it is cheap enough to own several, and it is genuinely the right answer under a work shirt on a hot day of physical work.
Its weakness is that it is a sports garment and it reads as one. The fit is compressive, the seams are visible under anything fitted, and the odour problem after a fortnight of hard use is real.
Under Armour HeatGear compression vest
The specialist version is the sweat proof undershirt, built with a bonded barrier sewn into the underarm to physically stop moisture reaching the shirt. Thompson Tee is the established name, with a patented barrier it calls Hydro-Shield. For anyone who sweats heavily enough that this is a daily problem, it is a better answer than another antiperspirant.
The weaknesses are obvious once you handle one: the barrier adds bulk and stiffness under the arm, it is warmer than a plain vest, and it is unmistakably a solution to a problem rather than a nice piece of cotton.
sweat proof barrier undershirt
Fit, colour and the three ways this goes wrong
Nearly every bad experience with a vest comes from one of three errors.
Too loose. A vest that billows does not wick, because wicking requires contact with skin, and it creates visible bulk at the waist under a tucked shirt. You should be able to pinch a small amount of fabric at the ribs and no more.
Too short. A vest that pulls out of the trousers when you raise your arms is worse than no vest, and cheap ones are cut short to save fabric. Lift both arms in the changing room and look at the hem.
Wrong colour. White under white is the mistake everyone makes. A vest in a shade close to your skin tone genuinely disappears under a light shirt, while white creates a hard edge visible through the fabric. Keep white for wearing under dark or opaque shirts, and buy the everyday ones in grey or a skin tone Why Men Are Frightened of Colour.
One more practical note: wash cool, skip the fabric softener, which coats fibres and destroys wicking outright, and keep everything out of the tumble dryer. Cotton rib in particular shrinks and hardens with heat.
Who should not buy one
The honest exclusions, because this is a garment with real limits.
If you run genuinely hot and your problem is heat rather than sweat marks, an extra layer of cotton will make the heat worse rather than better, and the answer is a thinner shirt rather than a vest under it.
If you mostly wear t-shirts, you already have a vest on. Adding another under it is a layer with no job.
And if your shirts are sheer, light coloured and worn with two buttons open on a summer holiday, accept that no undershirt is fully invisible in that combination. Wear one in a skin tone or wear none, but do not spend money hoping a white crew neck will hide A Field Guide to Vests: Singlet to Base Layer.
For everyone else, the argument is not complicated and it has never really been answered by anyone who mocks the garment. A vest keeps your shirts clean, makes them last longer, stops fabric sticking to your back in July, and adds a usable layer in January, at a cost of one thin knitted thing. There is no fashion in that, which is exactly why it works. The rest of Europe never stopped, and every year a few more people here quietly rejoin them fine rib cotton vest.
Questions people ask
Should you wear a vest under a shirt?
Yes, in most circumstances, and the reasons are practical rather than aesthetic. A vest absorbs sweat before it reaches the shirt, which keeps collars and underarms clean and extends the life of the shirt considerably. It also stops the shirt sticking to your skin and reduces friction under a jacket. The exceptions are sheer summer shirts worn open, where anything underneath will be visible, and situations where you are already too hot.
What is the difference between a singlet and an undershirt?
A singlet is the sleeveless version, covering the torso but leaving the shoulders and underarms bare. An undershirt more usually means the short sleeved crew or V neck, which covers the underarm and therefore catches sweat before it reaches the shirt. The sleeved version is the better choice under a business shirt for exactly that reason. The singlet is better in serious heat, under rough workwear, or as a warm weather layer where you want the underarm to breathe.
What colour undershirt is invisible under a white shirt?
A shade close to your own skin tone, not white. This is counterintuitive and it is consistently true: a white undershirt under a white shirt creates a distinct edge and a change in opacity that the eye picks up immediately, while a beige, tan or brown vest matched to your skin reads as skin rather than as fabric. Keep white undershirts for wearing under dark or heavyweight shirts, where they cannot be seen at all.
Is merino or cotton better for an undershirt?
Cotton is more comfortable at rest, cheaper and more durable, and it is the right answer for an office day. Merino is better whenever sweat or smell is the actual problem: it moves moisture as vapour before it becomes liquid, insulates when damp, and resists odour for days rather than hours. For travel, walking and anything where you cannot wash the garment daily, merino wins clearly. For a drawer of everyday vests, cotton rib is the sensible default.