COA: 77.77 GBp
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Home • Industry FAQs • Why is the zip is curved/humpy after pressing?

Spiral/coil zips have an S twist and Z twist in the teeth creating a “smile” or “frown” appearance when the teeth are joined. The left and right teeth should be both in the same direction/condition. If this is not the problem check the sewing tension is equal on both sides of the zip. Also check for any high levels of shrinkage in the fabric and any interlining.