Yes, polar fleece can shrink when washed, but only if exposed to high heat. High-quality 100% polyester polar fleece shrinks very little (2-4%) with proper care, while blended fabrics with cotton or wool may shrink more significantly.
Polar fleece is one of the most durable and low-maintenance fabrics available. With the right washing and drying techniques, you can keep your fleece jackets, blankets and accessories looking and feeling like new for years.
Key Takeaways
- High heat from hot water and dryers is the only cause of polar fleece shrinkage
- 100% polyester fleece shrinks the least (2-4%), while cotton blends shrink the most (5-8%)
- Always wash polar fleece in cold water on a gentle cycle
- Air drying is the safest method; use only low heat if machine drying
- Once shrunk, polar fleece cannot be fully restored to its original size, but you can improve its appearance
Does Polar Fleece Shrink Easily?
Polar fleece is made from polyester fibers, which are inherently resistant to shrinkage. Unlike natural fibers like cotton and wool, polyester does not absorb water and will not shrink under normal washing conditions.
However, polyester fibers have a relatively low melting point (160-180°C). When exposed to high temperatures from hot water or dryers, the fibers can contract and tighten, causing the fabric to shrink. This shrinkage is permanent and cannot be completely reversed.
Shrinkage Rates by Fleece Type
Different types of fleece have different shrinkage characteristics:
| Fleece Type | Typical Shrinkage Rate | Notes |
|---|---|---|
| 100% Polyester Polar Fleece | 2% – 4% | Minimal shrinkage with proper care |
| Polyester-Cotton Blend | 5% – 8% | Higher shrinkage due to cotton content |
| Cotton Fleece | 8% – 12% | Significant shrinkage, especially on first wash |
| Wool Blend Fleece | 6% – 10% | Prone to felting and shrinkage with heat |
What Causes Polar Fleece to Shrink?
The only significant cause of polar fleece shrinkage is exposure to high heat. Other factors can affect the fabric’s appearance but not its size:
1. High Heat Washing
Washing polar fleece in hot water (above 40°C/104°F) can cause the polyester fibers to contract. This is the second most common cause of shrinkage after machine drying.
2. High Heat Drying
Dryers are the biggest cause of polar fleece shrinkage. The high temperatures inside a dryer can quickly tighten the fibers and cause permanent shrinkage. Even the “medium heat” setting on most dryers is hot enough to damage fleece.
3. Poor Quality Fabric
Low-quality polar fleece with loose weaves or inferior fibers may shrink more than high-quality fabrics. Well-made fleece with tight weaves and strong fibers will maintain its shape much better.
How to Wash Polar Fleece Without Shrinking
Follow these simple steps to wash your polar fleece without causing shrinkage:
Best Washing Settings
- Water Temperature: Cold water only (30°C/86°F or below)
- Cycle: Gentle or delicate cycle
- Inside Out: Turn the garment inside out to prevent pilling
- Detergent: Use a mild, liquid detergent
- Avoid: Bleach, fabric softeners and harsh chemicals
Safe Drying Tips
Air drying is the safest method for polar fleece and will prevent any shrinkage:
- Gently squeeze out excess water (do not wring or twist)
- Lay the garment flat on a clean towel or drying rack
- Reshape it to its original size while damp
- Allow to air dry completely away from direct sunlight
If you must use a dryer:
- Use the lowest heat setting possible
- Remove the garment while it is still slightly damp
- Lay it flat to finish air drying
Common Mistakes to Avoid
- ❌ Do not wash in hot water
- ❌ Do not dry on high heat
- ❌ Do not use fabric softeners (they coat the fibers and reduce warmth)
- ❌ Do not overload the washing machine
- ❌ Do not iron polar fleece (high heat will melt the fibers)
Can You Fix Shrunken Polar Fleece?
Unfortunately, once polyester fibers have shrunk due to heat, they cannot be fully restored to their original size. However, there are several methods that can help improve the appearance and feel of a shrunken fleece jacket:
Methods to Restore Shape and Fluff
| Method | What It Does | Best For |
|---|---|---|
| Gentle Brushing | Lifts and realigns the fleece pile | All shrunken garments |
| Steaming + Brushing | Relaxes fibers slightly and restores fluff | Overall recovery |
| Damp Stretching | Gently stretches the fabric while damp | Minor shrinkage |
| Low-Suction Vacuum | Revives flattened pile in small areas | Spot treatment |
Step-by-Step Restoration Process
- Lightly mist the shrunken area with cool water
- Hold a garment steamer 5-10 cm above the fabric and move it in circular motions
- While the fabric is still warm and damp, gently stretch it with your hands
- Brush the pile in one direction with a soft-bristled brush
- Lay flat to air dry completely
These methods will not make the jacket return to its exact original size, but they can help it feel softer and look better. Prevention is always better than cure when it comes to polar fleece shrinkage.
Conclusion
Polar fleece is a low-shrinkage fabric that maintains its shape well when washed and dried correctly. Avoiding high heat and following proper care instructions are the best ways to prevent shrinkage and keep fleece soft, comfortable, and durable over time.
As a professional fleece apparel manufacturer, JINMAO produces high-quality polar fleece garments and fabrics for outdoor brands, workwear companies, private label programs, and bulk clothing production. Our fleece products are designed for long-lasting performance, shape retention, and consistent quality across large-scale manufacturing orders.
FAQ
Does 100% polyester polar fleece shrink?
100% polyester polar fleece shrinks very little (2-4%) when washed and dried properly. It will only shrink significantly if exposed to high temperatures from hot water or dryers.
Can you put polar fleece in the dryer?
You can put polar fleece in the dryer only on the lowest heat setting. Remove it while it is still slightly damp and lay it flat to finish air drying to prevent shrinkage.
How do you keep polar fleece from shrinking?
Always wash in cold water on a gentle cycle and air dry whenever possible. Avoid hot water, high heat dryers and ironing.
Can you iron polar fleece?
No, you should never iron polar fleece. The high heat from an iron will melt the polyester fibers and permanently damage the fabric. To remove wrinkles, hang the garment in a steamy bathroom or use a garment steamer.
How often should you wash polar fleece?
You can wash polar fleece jackets after 3-4 wears. Washing too often can cause pilling and reduce the fabric’s lifespan. Spot clean small stains to extend the time between washes.
