An invisible zipper is an ultra-light closed-end zipper that is hidden within a seam so it is best suited for dresses, skirts, pillowcases and pants.,
YKK 22 Concealed Zip
YKK 7 Jean Zipper-Baby Blue with Brass Teeth - Sew Much Fabric
Unique YKK Invisible Zippers 18-inch – Good's Store Online
YKK Ziplon Closed Bottom Zipper - 14 - Iced Blue – Needlework
YKK Sky Blue Invisible Zipper 22
YKK® #2 CONCEAL® Invisible 7 c/e 350/ LIGHT BLUE – S&J USA, Inc.
YKK Invisible Zipper Pull Purple 4mm - 55cm
Invisible Zipper Light Blue YKK 15CM Not Divisible
YKK Baby Blue Concealed Zipper – Sister Mintaka
50cm Ykk Invisible Zip Yiz-546
Concealed/invisible zips: blues/purples - Sew Irish