Leakproof fabrics are widely used in period underwear, activewear, swimwear, and reusable hygiene products. At the core of these fabrics are waterproof layers made from TPU or PU, two materials that are often confused but perform very differently.
This guide explains the key differences between TPU and PU leakproof layers, with a focus on comfort, durability, and dryer heat performance.
TPU Leakproof Layer
A TPU leakproof layer is made from Thermoplastic Polyurethane, a flexible plastic material that stretches with the fabric and returns to its original shape.
TPU is heat-bonded to fabric without chemical glue, creating a soft, smooth, and breathable leakproof barrier.
Key Benefits
- Excellent stretch and recovery
- Soft, smooth, and quiet in wear
- Strong bonding that resists cracking and peeling
- Better comfort for close-to-skin garments
- Designed for repeated washing
Used in: Period underwear, leakproof underwear, activewear, swimwear, and wet bags.
PU Leakproof Layer
A PU leakproof layer is made from Polyurethane and is typically applied as a coating or chemically bonded layer.
PU provides reliable waterproofing but has less stretch and flexibility and can feel firmer over time.
Key Characteristics
- Effective waterproof protection
- Lower elasticity compared to TPU
- Can feel firm or plastic-like
- More prone to cracking or peeling
- More cost-effective
Used in: Budget waterproof garments, mattress protectors, rainwear, and low-stretch products.
TPU vs PU Leakproof Layers: Quick Comparison
| Feature | TPU Leakproof Layer | PU Leakproof Layer |
|---|---|---|
| Stretch & flexibility | High | Low to medium |
| Comfort | Soft and smooth | Can feel stiff |
| Bonding method | Heat-bonded | Chemical coating |
| Durability | High | Medium |
| Breathability | Better | Lower |
| Heat resistance | Grade-dependent | Generally lower |
| Best for | Apparel & activewear | Basic waterproofing |
Will They Melt in the Dryer?
Short answer: No. Our period and incontinence underwear are designed to handle heat safely.
We have developed multiple new designs, including incontinence underwear with advanced anti-leak technology, built for real daily use. Many brands warn against tumble drying because their leakproof layers can deform or lose performance under high temperatures.
We solved that problem by using two specialized leakproof fabric options, each tested for heat resistance.
Option 1: Heat-resistant up to 110–130°C
This fabric is suitable for normal washing and low-to-medium heat drying. It maintains its leakproof performance without melting, warping, or delaminating when used under recommended care conditions.
Option 2: High-temperature resistance up to 230°C
This is our premium solution. It can withstand very high temperatures, which means tumble drying is safe. Even under dryer heat, the leakproof layer remains stable, flexible, and fully functional.
This level of heat resistance is uncommon in period underwear and sets our product apart from most other brands on the market.
Final Thoughts
Being able to tumble dry is not just about convenience. It improves hygiene, saves time, and fits better into modern laundry routines, especially for users who rely on incontinence or period underwear daily.
No melting. No damage. No compromise on leak protection.