Why Wool

Naturally Regulates Temperature

Wool works differently from most bedding materials. Its naturally crimped fibers create tiny pockets of air that provide insulation while still allowing heat and moisture to move away from the body. The result is a more stable, comfortable sleeping temperature throughout the night.

That’s what makes wool unusual: it can help keep you warm when it’s cold without trapping excess heat when it’s warm. For couples who sleep at different temperatures—or anyone who finds themselves throwing the covers off and pulling them back on all night—wool can help create a more even sleep environment.

Unlike many synthetic fills, wool doesn’t rely on simply trapping body heat to keep you warm. Its breathability and ability to manage moisture are what make wool bedding comfortable in every season.

Manages Moisture While You Sleep

Wool has a remarkable ability to absorb moisture vapor and release it back into the air, helping keep excess moisture away from your body while you sleep.

That matters because temperature and moisture are closely connected. When heat and humidity build up beneath your bedding, sleep can quickly become uncomfortable. Wool helps manage that changing microclimate around your body, creating a sleep environment that feels drier and more comfortable.

Unlike materials that can trap heat and moisture, wool continues to breathe throughout the night. It's one of the reasons wool can feel comfortable across changing seasons—and why generations of people have chosen it for bedding.

A Cleaner, More Comfortable Sleep Environment

Allergy-Sensitive Sleepers

Wool naturally helps create a dry, breathable sleep environment. Because dust mites thrive in warm, humid conditions, wool's ability to manage moisture can make the sleeping environment less favorable to them. For people sensitive to dust mites and other common bedroom allergens, wool bedding can be a comfortable natural choice.

Processed Without Harsh Chemicals

Some commercial wool processing uses treatments such as carbonizing to remove vegetable matter from raw wool. At the Frankenmuth Woolen Mill, we take a different approach. Our wool is washed with hot water and biodegradable soap, air-dried, and carded on our century-old equipment without harsh chemical processing.

Comfort for Sensitive Joints & Fibromyalgia

Wool's resilient fibers provide gentle cushioning and help distribute pressure, which can be particularly comfortable for sleepers with sensitive joints and pressure points.

Published research has also examined the use of wool among people living with fibromyalgia. In a six-week study of 50 patients, participants using wool clothing and wool bedding reported significant improvements in pain, tender-point counts and Fibromyalgia Impact Questionnaire scores compared with the control group.

Read the published study on PubMed →

Naturally Renewable. Responsibly Sourced. 

Wool is a naturally renewable fiber. Sheep grow a new fleece each year, giving us a remarkable natural material that can be used without relying on petroleum-based synthetic fills.

At the Frankenmuth Woolen Mill, we source Climate Beneficial™ wool from certified California ranches connected through Fibershed, a nonprofit working to build regional fiber systems rooted in responsible land stewardship. Climate Beneficial™ wool comes from ranchers using practices designed to build soil health, increase biodiversity and improve the land where their sheep graze.

We personally inspect the wool we purchase because where our wool comes from—and how it was raised—matters to us. Starting with exceptional wool is the first step in making bedding designed to perform beautifully and last for years.

Learn more about Climate Beneficial™ Wool at Fibershed →

What Research Says About Wool & Sleep

People have slept with wool for generations, but researchers are increasingly interested in understanding how the fibers surrounding us at night may affect sleep.

Studies from the University of Sydney have examined wool under both cool and warm sleeping conditions. Researchers found that wool's thermal and moisture-management properties can influence the microclimate around the body, with wool sleepwear associated with faster sleep onset and other sleep benefits under certain conditions—particularly among older and poorer sleepers.

Research has also examined wool clothing and bedding among people with fibromyalgia. In a six-week study of 50 patients, the group using wool reported significant improvements in pain, tender-point counts and Fibromyalgia Impact Questionnaire scores.

The science is still developing. A 2024 systematic review found promising results for certain fibers and sleeping conditions while also calling for more standardized research. And in September 2026, the New Zealand government announced funding for a new three-year clinical trial specifically comparing strong-wool bedding with synthetic alternatives.

We're pretty excited to see what they discover.

University of Sydney Wool & Sleep Research →
Wool & Fibromyalgia Study →
New Zealand Wool Sleep Research Project →

Wool vs. The Competition