Heated blankets

Sherpa vs flannel heated blankets: which is warmer?

Sherpa vs flannel is the fabric decision that decides how a heated blanket feels long before you touch the controller. Both are polyester constructions, both are soft, and both are safe over a heating element — but they behave differently, and one of them is measurably warmer with the heat switched off.

Written by the Coza team · Last reviewed 17 February 2026

Quick answer

Sherpa is warmer than flannel. Its long looped pile traps a thicker layer of still air against the skin, which is what actually insulates you, while brushed flannel is a shorter, flatter, lighter nap that feels smooth rather than plush.

Flannel wins on weight, breathability and drying time; sherpa wins on raw heat retention and on how it feels the moment you get under it.

Because the two fabrics are good at different things, the Coza heated blanket puts brushed flannel on one face and deep sherpa on the other, so you turn the blanket over rather than choosing at checkout.

Close-up of the brushed flannel face and sherpa reverse of the Coza heated blanket with the backlit controller in hand

Sherpa vs flannel at a glance

Warmth in a blanket is not the fabric itself — it is the air the fabric holds. Deeper pile holds more air, which is why sherpa outperforms flannel when the heat is off.

	Sherpa	Flannel
Warmth without power	Higher — long looped pile traps more air	Moderate — short brushed nap
Feel	Plush, lofty, enveloping	Smooth, flat, lightweight
Weight	Heavier	Lighter
Breathability	Lower — can feel too warm in a heated room	Higher — better for warm sleepers
Drying after washing	Slower	Faster
Best for	Cold rooms, sofa nights, winter	Year-round use, warm sleepers, bed use

Does the fabric change how hot a heated blanket gets?

No. The temperature is set by the heating element and the controller, not the cloth. What the fabric changes is how quickly that heat reaches you and how long it stays once the element cycles off.

A flannel face sits closer to the skin, so warmth transfers faster and feels more immediate. A sherpa face holds the heat longer after the element has cycled down, which is why sherpa feels warmer on a low setting.

On the Coza blanket the same carbon heating grid sits between both faces, reaching comfort temperature in about five seconds regardless of which side you turn up.

Which side should you sleep on?

A practical rule that holds for almost everyone:

Cold bedroom, winter, or you run cold — sherpa side down, against you. Lower heat setting needed for the same comfort.
Heated room, shared bed, or you overheat at night — flannel side down. More breathable, less trapped heat.
Sofa and evening use — sherpa side down every time. You are usually static and partly uncovered.
Anyone with sensitive skin — flannel side down. The shorter nap has less surface texture.

Washing sherpa and flannel heated blankets

Both fabrics wash the same way on the Coza blanket: unclip the controller, machine wash at 30 °C on a gentle cycle, then air dry flat. The difference is time — sherpa pile holds more water and takes noticeably longer to dry, so wash it in the morning rather than the evening.

Never tumble dry either fabric on heat, and never wash any heated blanket with the controller still attached.

Full step-by-step washing instructions are on the heated blanket washing guide linked below.

Frequently asked questions

Is sherpa warmer than flannel?

Yes. Sherpa has a longer looped pile that traps a thicker layer of still air against the skin, and trapped air is what insulates. Flannel has a shorter brushed nap, so it feels lighter and more breathable but retains less heat when the power is off.

Is a double-sided heated blanket worth it?

It is if you use one blanket year-round. A flannel face is more breathable for milder nights and shared beds; a sherpa face retains more heat for cold rooms. Having both means one blanket covers both cases instead of buying two.

Does sherpa shed or mat over time?

Sherpa can mat if it is tumble dried on heat, which melts and flattens the pile. Washing at 30 °C on a gentle cycle and air drying flat keeps the loft intact.

Which fabric is better for a heated throw on the sofa?

Sherpa. Sofa use is static and often only partly covered, so the extra heat retention matters more than breathability.

Part of our complete guide to heated blankets

This page covers one question in depth. For sizes, fabrics, safety, running cost and washing in one place, start with the main guide.

Heated blankets: how to choose one, and how to use it well

The Coza heated blanket

Nine heat levels, five-second warm-up, machine washable.

Brushed flannel over a sherpa reverse, a carbon element you never feel, and a shut-off you set from one to twelve hours. Four sizes from 100 × 150 cm to 180 × 200 cm, starting at €35.99.

See the heated blanket Find your size first