
Seamless Strength – How High-Frequency Welding Makes Our TPU Waterproof & Cooler Bags 100 % Leak-Proof
Ever wondered how a waterproof bag can survive cloud-bursts and white-water without a single stitch? The answer is high-frequency (HF) welding, the core technology in our Chinese factory. Instead of punching holes with needles, we fuse TPU film into one solid sheet, creating a joint that is actually stronger than the material itself.









