Fleece is a warmer fabric and heats up faster because its deeper pile traps more still air against the skin. Flannel pyjamas hold warmth more evenly and breathe far better, which makes them the safer choice if your bedroom is heated or you tend to wake up too hot. For most of our customers, the decision comes down to bedroom temperature rather than fabric loyalty.
Below, we cover how both fabrics are made, how they behave over a winter of washing, and when fleece pyjamas are worth the extra insulation.
Flannel Fabric Explained
Flannel is a woven fabric, usually cotton or a cotton-rich blend, that has been brushed on one or both sides to raise a soft surface called the nap. Those raised fibres trap air, and trapped air is what keeps you warm. The base cloth underneath is still a plain weave, so moisture can pass through it rather than sitting against your skin.
UK shop floors use 3 names for broadly the same thing. Flannel, flannelette, and brushed cotton all describe a brushed woven cotton, with flannelette traditionally meaning a lighter, single-sided brushed fabric and flannel implying a slightly heavier cloth. If a label says 100% brushed cotton, you are looking at flannel by another name.
We stock mid-weight cotton flannel in tartan and gingham checks, plain colours, and seasonal prints, in men's, women's, and children's sizes. It suits people whose bedrooms sit at a normal heated temperature, anyone who runs hot, and anyone who likes to pull a dressing gown over the top in the morning without instantly overheating.
Quick tip: To judge flannel quality, rub the fabric between your fingers and thumb. Good flannel has a dense, even nap and a substantial weight. Thin, papery cloth with a patchy brush will go bobbly within a few washes.
Fleece Fabric Explained
Fleece is a knitted synthetic fabric, almost always polyester, brushed to create a thick pile on one or both faces. Because it is knitted rather than woven, and because the pile is deeper than a brushed cotton nap, it holds a much larger volume of still air. That is why fleece feels warm within seconds of putting it on, while flannel takes a little longer to reach temperature.
The trade-off is airflow. Polyester pile does not pass moisture as readily as woven cotton, so body heat and perspiration build up inside the garment. If your bedroom is warm, that is how you end up kicking the duvet off at 3 am and waking up clammy.
Shoppers in the UK will meet a few fleece variations. Microfleece is the lightest and most compact. Coral fleece has a longer, plusher pile and is the fluffiest option. Sherpa-lined styles use a textured pile on the inside face for extra loft. All behave the same way thermally, just at different intensities.
Fleece earns its place in cold or draughty bedrooms, in houses where the heating goes off overnight, for early starts in January, and for children who kick their covers off and sleep uncovered for half the night. Care is straightforward but non-negotiable: wash cool, tumble dry on low heat only, and skip the fabric softener, which coats the pile and flattens it.
Flannel vs Fleece: Warmth, Breathability, and Care Compared
| Feature | Flannel | Fleece |
|---|---|---|
| Fibre and construction | Woven cotton or cotton blend, brushed to raise a nap | Knitted polyester, brushed into a deep pile |
| Warmth | Warms gradually, then holds a steady temperature all night | Warms within seconds, highest peak insulation |
| Breathability and moisture | Good airflow, releases moisture through the weave | Limited airflow traps warm air and moisture |
| Feel against the skin | Soft, dry, and matte, softens further with washing | Plush and fluffy, it can generate static cling |
| Washing and drying | Cool or 30°C wash, tumble dry on low heat, air dries slowly | Cool wash, low heat tumble only, dries very quickly |
| Longevity and pilling | Nap flattens slowly over a few seasons | Pile can bobble sooner, especially at cuffs and the seat |
| Best bedroom temperature | Heated rooms, roughly 16 to 20°C | Unheated or draughty rooms, below 16°C |
| Best for | Year-round wear, layering, hot sleepers | Deep winter, cold feet, uncovered sleepers |
On raw warmth, fleece wins. A deeper pile holds more insulating air than a brushed woven face can.
For sleeping comfort throughout the night, flannel often wins. Your core temperature drops in the first few hours and rises again towards morning, and the woven cotton base in flannel lets heat and moisture escape rather than holding them in. That is why flannel feels neither cold at 11 pm nor stifling at 4 am.
Care separates them, too. Flannel tolerates a warmer wash and gets softer with age. Fleece needs consistently cool washes and low-heat drying because heat melts and mats polyester pile.
Choosing between Flannel and Fleece for Colder Nights
If your bedroom is unheated, draughty, or in a converted loft or extension, buy fleece. If the heating runs into the evening and the room holds its warmth, buy flannel. Those two rules cover the majority of decisions we help with.
For menopause, night sweats, or anyone who overheats, our flannel pyjama sets are the clear pick. Brushed cotton moves moisture away instead of sealing it in, so you are far less likely to wake up damp. If the problem is only cold feet and poor circulation, keep a flannel for the body and add bed socks rather than switching to a heavier fabric everywhere.
Children are usually better in fleece, because they sleep uncovered for long stretches and need insulation that works without a duvet. Teenagers tend to run hot and prefer flannel. Couples who argue about the thermostat often solve it by sleeping in different fabrics in the same bed, which is quietly the most popular fix we see.
For genuinely cold rooms, layering beats buying one thicker fabric. A flannel base with a fleece dressing gown over the top gives you something to take off at 2 am, which a single heavyweight set does not. Whichever you pick, allow for a slightly roomier fit, because the air gap between the fabric and your skin does half the insulating work. Many households end up owning both: flannel checks for autumn and spring, fleece for the January cold snap, plus a Christmas print set for the photographs.
Shop Flannel Pyjamas and Fleece Sets
Pick the fabric that suits your bedroom, then shop the set. Browse our flannel pyjamas for breathable brushed cotton warmth, or our fleece sets if your bedroom runs cold. Both fabrics are stocked across men's, women's, and children's sizes, so a household can mix and match without anyone compromising.
If you are torn between the two or unsure which size to order, get in touch with our team, and we will talk you through the fabric weights.
Flannel Pyjamas: FAQs
Can you wear flannel pyjamas all year round?
Yes, and plenty of our customers do. Because the base cloth is woven cotton, flannel releases heat as well as holding it, so a mid-weight set stays comfortable through spring and autumn. In mid-summer, most people switch to a lighter cotton or jersey, but flannel handles everything from September to May in a typical UK bedroom.
What is the difference between flannel and brushed cotton?
Very little. Brushed cotton is the process, flannel is the finished fabric, and UK retailers use both terms, plus flannelette, almost interchangeably. Where there is a distinction, flannelette usually refers to a lighter cloth brushed on one side only, while flannel suggests a heavier weave brushed on both sides. Always check the stated fabric weight rather than the name.
Are fleece pyjamas a good choice for children?
They are, particularly for children who kick off their covers. Fleece retains its insulating properties without a duvet, dries quickly after a wash, and resists creasing. Keep the fit comfortably roomy rather than snug, wash cool, and tumble dry on low heat so the pile stays soft rather than matting down.
How long do flannel pyjamas last before they lose their softness?
A good cotton flannel set will stay soft for 2 to 3 winters of regular wear, and often softens further in the first few months as the nap relaxes. What shortens that life is hot washing and high-heat drying, which flattens the brushed fibres. Wash at 30°C and dry on low to keep the nap intact.
Can you tumble dry flannel pyjama bottoms?
Yes, on a low heat setting. High heat shrinks cotton and crushes the nap, so the fabric comes out stiffer than it went in. Pull them out while slightly damp and hang them to finish, and skip the fabric softener, which leaves a residue that dulls the brushed surface over time.
