Wool Felt Replacement Boot Liners - FAQ

Why Choose Wool?

Wool is a powerhouse natural material that shines in winter, thanks to its remarkable ability to keep you warm and dry. One of its greatest strengths is how it manages moisture—it can absorb up to 30% of its weight in water vapor without compromising its insulating power. This means it keeps you cozy even in damp conditions.
The crimped structure of wool fibers traps air, helping to regulate your body temperature by holding onto heat when it’s cold and releasing it when you're warm. Unlike synthetic materials, wool draws moisture deep into the core of each fiber—thanks to its keratin-based scales—rather than leaving it sitting on the surface. These same tiny scales allow the fibers to interlock, making wool incredibly durable and resistant to tearing and wear.
As a bonus, wool is naturally antibacterial, helping to prevent unpleasant odors—perfect for winter boots and cozy footwear.

Which is Better - 100% Wool or a Wool Blend?

Great question! Wool is a natural powerhouse when it comes to insulation and moisture management. It provides excellent thermal protection, keeping your feet warm even in the harshest winter conditions. Its fibers can absorb up to 30% of their weight in moisture without feeling wet, helping regulate temperature and wick away perspiration. However, one downside of 100% wool is that it takes longer to dry once saturated, and while it's durable, it may be more prone to wear and tear over time with heavy use. 
Synthetic fibers, on the other hand, don’t offer the same level of insulation. They don’t absorb moisture instead, they hold it on the surface, which allows them to dry quickly. Synthetics are also highly durable and resistant to abrasion, making them a smart choice for added strength and longevity. But on their own, they lack the breathability and warmth that wool naturally provides. 
That’s why The Felt Store’s Boot Liners use a thoughtfully engineered blend: 75% wool and 25% polyester. This combination delivers the best of both worlds. The high wool content retains the superior insulation, breathability, and moisture-wicking properties that make wool ideal for cold climates, while the 25% polyester adds strength, tear resistance, and a quicker drying time. This blend allows the boot liners to perform exceptionally well in extreme conditions down to -40°C while staying durable, comfortable, and practical for everyday wear.

Why Wicking Matters: Stay Warm, Dry, and Comfortable

When it’s freezing outside and your feet are working hard, moisture can quickly become your worst enemy. As the warm air around your feet meets the cold environment, condensation forms inside your boots, especially if they’re not breathable. Add in sweat or water from snow and slush, and your cozy winter walk can turn uncomfortable fast. 
That’s where moisture-wicking materials come in. They pull moisture away from your skin and move it toward the outer surface of the fabric, helping it evaporate more quickly. This is crucial because wet feet lose heat up to 25 times faster than dry feet, dramatically increasing your risk of hypothermia in extreme cold. On top of that, constant moisture combined with friction can cause painful blisters, cracked skin, and even fungal infections like athlete’s foot.

More Than Just Replacements

Felt boot liner replacements aren’t just for reviving worn-out winter boots, they’re a smart, multi-purpose upgrade. Originally designed as an insulating layer inside work or winter boots, these liners improve warmth, breathability, and comfort in any cold-weather setting. Whether you're braving snowstorms, working in sub-zero temperatures, or hiking through slushy trails, moisture-wicking felt liners help you stay dry, warm, and ready for whatever the season throws your way.

How to Choose the Right Size Boot Liner

Finding the perfect fit is easy with a few quick steps no guesswork needed! 
👉 Important Note: These liners are not designed for boots with permanent linings or tongues that are sewn all the way to the top of the boot. They work best in boots where the liner can be removed or replaced.

✅ What to Know Before You Measure:

• Liners are unisex and shaped to fit either foot—there’s no left or right.
• They’re designed to fit snugly inside your boot while still being comfortable on your foot.

💡 Pro tip: Your new liner should feel snug but not tight—it needs to fill your boot comfortably without bunching or shifting.
Ready to upgrade your boots? A well-fitting liner can make all the difference in warmth, comfort, and performance!

Boot Liners That Give Your Feet Room to Breathe

Boot liners with a slightly roomier shape offer extra comfort where it matters most—around the toes, instep, and forefoot. This makes them a great choice for anyone who finds standard liners too snug or plans to wear thick, insulated socks in cold weather. The added space helps reduce pressure points and improves circulation, which is key for keeping your feet warm and comfortable in freezing temperatures. To get the most out of these liners, make sure your boots have enough internal space to accommodate the added volume for a secure but relaxed fit.

What Kind of Boots Work Best?

These boot liners are specially designed for boots with removable liners—the kind where you can easily take the inner layer out and swap it with a fresh one. This makes them perfect for extending the life of your favorite winter or work boots while boosting warmth and comfort. Our liners come in 2 height variations as well, allowing some flexibility for different boots.
Important fit note: They’re not intended for boots with permanent linings or tongues that are fully attached to the top of the boot, as this can make inserting and removing the liner difficult or uncomfortable.

Got boots with a removable liner and a bit of wiggle room inside? Chances are, our boot liners will be a perfect fit—no pun intended!
Still unsure? Just pop out your original liner and take a quick measurement, then match it up using our sizing guide for a snug, cozy fit.
Already using our liners in a different boot style and loving the results? We want to hear from you! Shoot us an email at sales@thefeltstore.com and let us know what boots you're pairing them with—we’d love to add your pick to our growing list of tried-and-true favorites!

Why Boot Shape Matters When Adding Felt Liners

When upgrading your boots with thick felt liners, don’t just think about size—shape matters, too. The curves, angles, and contours inside your boots play a big role in how well the liner fits and how comfortable it feels.
Thicker liners naturally take up more space, and in boots with sharp curves or narrow spots—like the heel, instep, toe box, or ankle bend—that extra bulk can create tight areas, cause bunching, or even make it hard to slide your foot in smoothly. If the liner doesn't sit properly, it can lead to pressure points, discomfort, or uneven wear over time. In some cases, forcing a thick liner into a boot that’s too narrow or angular can even damage the liner or wear down the boot’s interior.
To avoid all that, take a moment to check your boots’ internal shape. If your boots have snug curves or tight angles, consider a slightly thinner or more flexible felt liner that can mold more easily to the interior. Or, if you’re shopping for new boots, look for ones with a bit more room—especially if you plan to wear thick liners regularly. A good fit means warmer feet, longer-lasting liners, and boots that feel as good as they perform.

📩 Still not sure if your boots will fit our liners? Email us a photo of your boots at sales@thefeltstore.com and we’ll do our best to help you figure it out!

If you have already purchased a liner, but need a different size? No problem! Please see more information about our shipping and returns here:

• 🔗 Canada Customers
• 🔗 USA Customers

👣 Don't Forget About Insoles!

While boot liners keep your feet warm and insulated, pairing them with the right insoles can take your comfort to the next level. Our 100% wool insoles and wool blend options offer extra cushioning, moisture-wicking, and insulation right where you need it—underfoot.
Whether you're on your feet all day, out in the cold, or just want a little extra warmth and support, wool insoles are the perfect companion to our felt boot liners.
Explore Our Wool Insoles:

• 🔗 100% Wool Insoles – 13mm Thick – Natural Warmth & Cushion
• 🔗 100% Wool Insoles – 8mm Thick (2 Pair Pack) – Durable & Flexible

Whether you're braving freezing job sites, trekking through snowy trails, or just trying to keep your toes warm all winter long, the right boot liner makes all the difference. By choosing a liner that fits both your boot and your lifestyle—from material and thickness to shape and flexibility—you’re setting yourself up for warmer, drier, more comfortable feet. And don’t forget the small upgrades that make a big impact—like pairing your liners with wool insoles for added cushioning and insulation. Ready to upgrade your boots? Explore our full collection of felt boot liners and wool insoles to find your perfect fit.

• 🔗 Canada – Footwear
• 🔗 USA – Footwear