UGG boots are known for their plush comfort and snug fit, which is why many first-time buyers feel surprised when their boots start to feel loose after a few weeks of wear. This change in fit is completely normal and linked to the natural materials used in sheepskin boots. Understanding why this happens can help you choose the right size, maintain comfort, and extend the lifespan of your footwear.
This guide explains why UGG boots loosen, how the materials behave over time, and practical ways to maintain a comfortable fit.
Why Do UGG Boots Feel Loose After Wearing Them?
UGG boots are designed to fit snugly at first. Unlike synthetic footwear, natural sheepskin and suede adapt to the shape of your feet. This adaptation is what makes them comfortable, but it can also make them feel larger after regular use.
Sheepskin Lining Compresses with Wear
The inside of UGG boots is lined with thick wool fibres that act like tiny springs. When new, these fibres stand upright and provide cushioning. Over time, body heat and pressure flatten the fibres, creating more internal space.
- Wool fibres compress under body weight and repeated pressure
- Flattened fibres reduce padding and increase internal volume
- Boots may feel up to half a size larger after break-in
Sheepskin is widely used in footwear because of its natural insulation and pressure-distribution properties, which is why it is also used in medical and bedding products.
Suede Leather Naturally Stretches
The outer suede layer is flexible and soft, which allows it to mould to your foot shape. As you walk, the suede relaxes and stretches slightly, especially around the toes and sides of the boot.
This stretching is not a defect. It is a normal characteristic of natural leather, which becomes more supple with movement and wear.
The Break-In Period Changes the Fit
Most UGG boots go through a break-in period during the first one to two weeks of regular wear. During this time, the lining compresses and the suede softens, allowing the boot to adapt to your foot structure.
For many wearers, this process improves comfort. For others, especially those who purchased a slightly loose size, it can lead to heel slip or a roomy feel.
Initial Sizing Plays a Major Role
UGG boots are intended to feel snug when new. If they feel comfortable straight away, they are likely to become loose later. Choosing the correct size is one of the most important factors in long-term comfort.
Foot shape also matters. People with narrow heels or low-volume feet may notice loosening more than others.
How Common Is This Issue?
Sheepskin boots are popular worldwide, and the market continues to grow due to demand for comfort footwear. The global UGG boots market was valued at more than USD 2.2 billion in 2024 and is projected to reach over USD 3.2 billion by 2032, growing at around 5% annually.
- Global UGG boots market value (2024): over USD 2.2 billion
- Projected market value by 2032: over USD 3.2 billion
- Annual growth rate: approximately 5%
This growth is driven largely by consumer demand for comfort, natural materials, and casual fashion trends.
How to Fix Loose UGG Boots
If your boots feel loose, there are several practical ways to restore a snug fit without replacing them.
Add New Sheepskin Insoles
Replacing flattened insoles with new plush sheepskin insoles is one of the most effective fixes. Insoles add cushioning and reduce extra space inside the boot.
Wear Thicker Socks
Although many people wear UGG boots barefoot, thicker socks can help fill extra room, especially in cold weather. Wool socks are particularly effective.
Replace Worn Inner Soles
Innersoles wear down faster than the outer boot. Replacing them can make boots feel closer to their original fit.
Wash and Air-Dry Carefully
Washing can slightly tighten stretched suede, but washing your UGG boots should be done with caution. Always air-dry naturally and avoid direct heat sources such as radiators or hairdryers, which can damage the leather.
How to Prevent UGG Boots from Stretching Too Much
Start with a Snug Fit
When trying on new boots, they should feel firm but not painful. A snug fit allows for natural loosening without becoming oversized.
Break Them In Gradually
Wear boots indoors for short periods at first. Gradual wear helps the materials adapt without overstretching.
Rotate Between Pairs
Switching between pairs allows the sheepskin to recover and maintain its shape. Constant daily wear accelerates compression.
Why Heel Slip Can Happen Even in the Right Size
Heel slip does not always mean the boots are too big. New boots can feel stiff before the sole flexes. This stiffness can cause temporary heel movement until the boot naturally bends with wear.
Foot anatomy also affects fit. People with narrow heels may experience more slip, even in correctly sized boots.
Questions Readers Often Explore About UGG Boots
- Do UGG boots stretch half a size or more?
- How long does it take for UGG boots to break in?
- Can UGG boots shrink back after stretching?
Key Takeaways About UGG Boot Fit Changes
- UGG boots loosen naturally as sheepskin compresses and suede relaxes
- Most fit changes happen within the first few weeks of wear
- Correct sizing is critical for long-term comfort
- Insoles and socks are simple ways to restore a snug feel
- Foot shape affects how boots fit and break in
Final Thoughts: Should You Worry About UGG Boots Feeling Loose?
UGG boots are designed to adapt to your feet, which is why they change over time. A slight loosening is normal and often improves comfort. By choosing the right size and caring for your boots, you can enjoy warmth, cushioning, and comfort for many seasons.
Understanding how sheepskin and suede behave helps you make informed decisions when buying and wearing UGG boots, whether you are purchasing your first pair or adding to your collection.
