It's eight in the evening. The thermostat in the hall says 68°F. You're on the couch in a T-shirt and leggings, and the blanket hasn't left your knees since dinner. If you're always cold indoors in winter, that scene probably sounds familiar.
Most answers to this problem point at your body or your furnace. Both matter. But there's a simpler variable sitting right against your skin, and it's the one you can change tonight. Our women's merino base layers are built around that layer, not the sweater you pile on top of it.
If you feel cold even when the room is properly warm, that's worth raising with a doctor. For everyone else, here's where your heat actually goes, and what your clothes can do about each route out.
Your Thermostat Assumes You're Wearing a Sweater
Your thermostat measures the air, not you. Whether 68°F feels comfortable depends on what you're wearing, and the setting quietly assumes more than most of us wear at home. That assumption covers your legs as well, which is why merino base layer bottoms matter as much as tops.
The comfort ranges heating engineers work to come from ASHRAE Standard 55. Its winter range is built around a specific outfit: trousers, a long-sleeve shirt, a sweater and a T-shirt underneath. Engineers rate that outfit at about 1.0 clo, the unit for how much insulation clothing provides.
The U.S. Department of Energy suggests around 68°F to 70°F while you're awake in winter. That's a sensible setting for a sensible outfit. A T-shirt and sweatpants are not that outfit.
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Here's how common at-home outfits compare with the winter benchmark, using ASHRAE's published clothing values.
| What you're wearing | Insulation (clo) | Against the winter benchmark |
|---|---|---|
| T-shirt and sweatpants | About 0.36 | Roughly a third |
| Sweatshirt and sweatpants | 0.74 | About three quarters |
| Trousers, long-sleeve shirt, sweater and T-shirt | 1.01 | The benchmark itself |
ASHRAE puts the effect at roughly 11°F for every full clo at light activity. On that arithmetic, a T-shirt and sweatpants need a room several degrees warmer than 68°F to feel the same. That gap is what the blanket is filling. Sitting still on the couch widens it, because a resting body makes less heat than a moving one.
The same standard explains why offices run cold in summer, where you can't touch the thermostat. At home in winter, the fix is in your own wardrobe. In our survey of 141 customers, 26.2% listed home or indoors as a place they wear their merino. That everyday, indoor use is what this article is about.
Cold Windows Make You Cold Indoors Even When the Air Is Warm
Your body doesn't only lose heat to the air. It also radiates heat to the surfaces around you. A cold window or an outside wall pulls heat off you even when the air beside it feels fine. Building researchers call this mean radiant temperature, and it's why the chair by the glass always feels colder.
Your thermostat can't see any of this. It usually sits on an inside wall, reading warm hallway air. Meanwhile your favourite seat sits next to the coldest surface in the house.
Closing the curtains and moving the chair both help, and they cost nothing. Clothing helps too, because covered skin loses less heat than bare skin. That's where sleeves earn their place. A long sleeve or a women's quarter zip covers the forearms a T-shirt leaves facing the window. The zip gives you a collar to close when you settle in and open when you get up.
The Women's Merino 170g All-Season Long Sleeve Crew is the one we'd reach for first. It's light enough to wear all evening. Customers describe our base layers as a "layering piece," and that's the job here: one close layer under whatever you already wear.
Cold Floors and Drafts: Why Your Feet Decide How Cold You Feel
Floors are often the coldest surface in a heated room. Tile, laminate and anything over a slab or crawlspace are the worst offenders. Bare or thinly socked feet lose heat to them by direct contact, all evening long. A pair of merino wool socks and slippers on hard floors is the first change worth making.
That matters more than it sounds. Hugh Montgomery, a professor at University College London, notes that the temperature of your hands and feet dominates how cold you feel overall. He also points out that drafts make us feel cold out of proportion to their size, and that warm air escapes at the neck.
So the most efficient fixes are often at the edges of your body, not the middle. Warm feet first, then a covered neck, then sleeves that reach your wrists. We cover closing the gaps at your cuffs and neckline in Warm Without Bulk, so we won't repeat it here. Montgomery sums up the whole approach in one line: heat the human, not the house.
Why You're Warm Doing Chores and Cold the Moment You Sit Down
This is the moment our men's merino base layers and the women's range are designed around: the quiet after the busy part. You unload the dishwasher, carry laundry upstairs and cook dinner. You're warm, maybe slightly damp. Then you sit down, and before long you're reaching for the blanket.
Two things happen at once. Your heat output drops as soon as you stop moving. And the moisture you produced is still in the fabric against your skin. We explain the damp-layer problem in detail in what actually makes a fabric breathable. The short version is that cotton feels cosy when it's dry, which is why it's the default for loungewear. The myth is that it stays that way after a busy hour.
Wool behaves differently, and the reason is measurable. Wool absorbs moisture vapour into the fibre, and according to The Woolmark Company it releases heat as it does. Woolmark's research also found wool reduces the chill after activity. It lets go of that moisture slowly, which keeps skin temperature higher for longer. Our merino absorbs up to 30% of its weight in moisture before it feels wet.
The same warm-then-still chill turns up far from home too. It's behind the cold dining room on a cruise ship and the mixed temperatures of traveling from cold to warm weather.
It also shows up on ordinary days that start cold and end warm, which we cover in what to wear when it's cold in the morning and hot in the afternoon.
Comfort matters here as much as warmth, because this is a layer you'll wear from dinner to bedtime. Customers describe merino as "soft and comfy" and "non-scratchy." At 18.5 microns, the fibre is fine enough to bend against skin rather than prickle. If wool has bothered you before, here's why merino feels different. The Men's Merino 170g All-Season Long Sleeve Crew is the easiest place to start.
How a shirt holds up over hours of wear matters too. We looked at that hour by hour in what happens to a t-shirt after all-day wear.
Tight or Loose? Building a Warm-at-Home Outfit
Fit matters because each layer has a different job. The layer against your skin works best close to it, where it can deal with moisture as it forms. The layer on top works best with a little room, because still air trapped between layers does the insulating. Several thin layers trap more of that air than one thick sweater.
In practice, start with a close merino tee or long sleeve. Then add a looser sweatshirt or cardigan over it when you sit down, and take it off when you get up. Our women's crew tee is the simplest starting point, and you'll find it in our women's merino T-shirts. On Amazon, it has 493 reviews at an average of 4.3 stars.
For a home kept at 68°F to 70°F, the Women's Merino 170g Crew T-Shirt is the everyday weight. Step up to 200g if your house runs cool, and see our merino wool weight guide for the full range.
Be honest with yourself about fit before you order. Our cut is slim, and the fit comment we see most often in reviews is that it's snugger and shorter in the torso than people expect. If you want a relaxed drape for the couch, size up.
What Clothes Can't Fix When You're Always Cold Indoors
Nothing in our men's merino clothing or the women's range changes the building around you. A better base layer won't seal a drafty door or insulate a single-pane window. It won't keep your fingers warm while you type, either. Those are house problems and hand problems, and draft stripping or fingerless gloves solve them better than any shirt.
What clothing does is close the gap between the outfit your thermostat assumes and the one you're actually wearing. For evenings when the heating is turned down, the Women's Merino 250g Long Sleeve Crew is the warmest crew we make. Customers have described our merino as "thicker than I expected," and at 250g that's fair. It's why we don't recommend 250g for every day in a warm house. Save it for the cold room, not the heated one.
Because this will be your at-home layer, it'll get washed often. Machine wash warm on a gentle cycle, never tumble dry, and line dry in the shade. Our guide on how to wash merino wool covers the details.
One last sizing note. All our tops run slim with a shorter torso. Size up if you're between sizes or want a looser fit over leggings.
Why does my house feel cold at 70 degrees?
Usually because the air is 70°F but the surfaces around you and your clothing aren't keeping up. Cold windows, outside walls and floors pull heat off you even when the air is warm. The comfort range behind a 70°F setting also assumes winter clothing of about 1.0 clo. A T-shirt and sweatpants give roughly 0.36 clo. Close that gap with a 170g merino long sleeve and warm socks before you touch the thermostat.
What is the best temperature to set your thermostat in winter?
The U.S. Department of Energy suggests around 68°F to 70°F while you're awake and at home, and lower while you sleep or are out. That range suits most people dressed in winter clothing. If 68°F feels cold in a T-shirt, add insulation at your skin first. A 170g merino long sleeve and warm socks can make 68°F comfortable without raising your heating bill.
What is the cheapest thing to try before turning the heating up?
Change what's on your feet and against your skin. Your hands and feet drive how cold you feel overall, so warm socks and slippers on hard floors come first. Then swap a short-sleeve tee for a close-fitting long sleeve. A 170g merino long sleeve sits under the clothes you already own. It's a one-time cost, while every extra degree on the thermostat is paid for all winter.
Do tight or loose clothes keep you warmer?
Both, in the right order. The layer against your skin should sit close, so it can handle moisture before it chills you. The layers over it should be looser, because trapped still air does most of the insulating. A slim 170g or 200g merino base layer under a looser sweatshirt or one of our men's long sleeve quarter zips beats one tight, thick top. Our cut runs slim, so size up if you want room.
Why are two thin layers of clothing warmer than one thick layer?
Each layer traps its own pocket of still air, and still air is a good insulator. Two thin layers hold air inside each fabric and in the gap between them. One thick layer has no gap. Thin layers also let you adjust as you move around the house. A 170g merino base layer under a light sweater gives you that extra air pocket, and the sweater comes off easily when you start cooking.
Does cotton keep you warm in winter?
Dry cotton keeps you reasonably warm while you sit still. The trouble starts when it holds moisture from a busy hour, because damp fabric insulates less well. Merino absorbs up to 30% of its weight in moisture before it feels wet, so it stays drier against your skin. Cotton is fine for a lazy evening. For days that mix chores and the couch, a merino layer underneath works better.
The Thermostat Can Stay Where It Is
Back on the couch at eight in the evening, the thermostat still says 68°F. Nothing about the house has changed. What changed is the outfit under the blanket: a close merino layer, sleeves facing the window and warm socks on the cold floor. If you're always cold indoors in winter, start there before you start on the furnace.
Our merino is 18.5 microns (17.5 in some women's styles), Woolmark certified and OEKO-TEX Standard 100 Class I. It's 100% Australian merino wool, sourced under the Responsible Wool Standard. Our 90-day warranty comes standard, and you can register for a free 1-year extension, including 15% off your next order. When you're ready, the women's merino wool clothing range is the easiest place to find your at-home layer.
