Flannel Sheets: What GSM to Buy
Flannel sheets: what to know
When it comes to flannel, count on GSM as the spec that signals true quality. Here’s what to look for and how to pick your sheet set.
What flannel actually is
Flannel is a brushed cotton fabric known for its soft, fuzzy feel and cozy warmth. Flannel isn’t a fiber itself—it’s a finishing process applied to woven cotton. That’s why the quality comes down to two things—the integrity of that starting fiber, and the GSM. GSM stands for grams per square meter, essentially the weight of one square meter of fabric.
The Quince Luxury Organic Flannel Sheet Set is 100% organic cotton woven in a 165 GSM plain weave and brushed for extra softness and lasting warmth. It’s STANDARD 100 by OEKO-TEX® certified.
Look for GSM as the quality signal
It’s important to note that flannel quality is measured in GSM, not in thread count. A higher GSM number means heavier, denser cloth—your best bet for flannel sheet sets that offer incredible warmth and longevity. You can usually find the GSM listed in the product specs. Here’s a quick breakdown on how the GSM numbers translate to real life:
GSM under 150: This is considered a thin, lightweight flannel—it will fade and pill sooner.
GSM 150-190: This is mid-weight flannel, a fair balance of warmth and durability.
GSM 200+: This is a high-end, heavyweight flannel—the warmest and longest-lasting.
Who is flannel best for?
Flannel is best for cold bedrooms and sleepers who run cold. Many people switch to flannel sheets as the weather shifts to winter because it delivers some of the most incredible warmth of all cotton sheet types. It also brings the feeling of slipping into a pair of comfy-cozy pajamas. For most people, flannel sheets work best as a seasonal swap. It’s not a good match for anyone who sleeps hot or lives in a warm or humid climate.
Flannel sheet care
Flannel is easy to care for and maintain for many years of use. A machine wash in warm, not hot, water will help protect the nap and keep it from breaking down early. Avoid fabric softener when washing, since it coats those fuzzy raised fibers and tends to flatten them—the exact thing that makes flannel feel so good in the first place. Tumble dry on low or line dry if you like.
If you notice your flannel pilling a bit in the first year, not to worry. That’s a natural and expected facet of brushed cotton, and running a fabric shaver over your sheets once will help keep it in check.
When it’s time to retire your flannel sheets for the season, fold them loosely and store them in a dry linen closet.
When to switch from flannel to percale
The rule of thumb is to dress your bed in percale for spring and summer, and flannel sheets for fall and winter. For four-season climates, this makes October a great time to switch out to flannel and April to swap back to percale. The GSM of your flannel sheets also plays a role—a mid-weight set (150-190 GSM) will stay comfortable for a bit longer stretch at seasonal transitions in milder climates, while a heavier 200+ GSM suits long winters.
Keeping both a percale set and a flannel sheet set in rotation covers the whole year nicely. Flannel brings the warmth in the cold, and percale keeps your overnights feeling crisp and cool in fairer weather.
ALL YOUR QUESTIONS, ANSWERED
What is flannel?
What is flannel?
Flannel is a cotton weave that’s been brushed on the surface to create a warm, fuzzy nap. It’s the nap that holds onto warmth, giving flannel its soft, cozy feel when compared to a standard cotton sheet.
What GSM should flannel sheets be?
What GSM should flannel sheets be?
A good indicator of quality is a GSM of 150 or greater. If the weight is under 150 GSM, the flannel tends to be thinner, fading and pilling faster. If you find flannel rated at 200+ GSM, this is a set that will give you the warmest, most durable flannel available.
Do flannel sheets pill?
Do flannel sheets pill?
Some pilling in the first year is normal when it comes to brushed cotton. Usually that can be easily resolved with one pass of a fabric shaver. You’ll notice a big difference in pilling if you choose a higher quality flannel with a higher GSM.
How do you care for flannel?
How do you care for flannel?
Flannel should be machine washed on warm and tumble dried on low (or line dried). Avoid hot water and fabric softeners to prolong the life of the nap, which gives the flannel its soft, cozy texture.
When should I switch to flannel?
When should I switch to flannel?
Most people transition to flannel in the fall, beginning in October as temperatures really start to drop overnight. They’ll switch back to a lighter, cooler sheet like percale when spring hits, around April. If you live in a colder climate, you might find you get a longer season with your flannel than most, and the reverse is true if you live in a milder area.
