This is 607 stitch on a pair of exercise shorts made of 85% polyester and 15% spandex. It's found as decoration seaming mostly, down…
Stitch terminology.pdf
Stitch Types, PDF, Knitting
flatlock underwear,sportswear, outdoor clothing manufacturer
Flatlock seam, flatlock stitch, iso 607
VF2560 :: 4 Needle 6 Thread Flat Bed Interlock Stitch Machine with Active Thread Control for General Seaming, VF2500-8 series - Interlock (Flatlock/Coverstitch), Products
Flatlock seam, flatlock stitch, iso 607
Wetsuit Seam Repair, SRFACE®
Introducing Flatlock Seam Stitching technology ISO-605 and ISO-607, By Speda
Sewing Seams that Look Like Flatlock
Stitch Classification
Activeseam: The Stitch Profile
flatlock stitch seam activeseam merino wool thermal underwear, baselayer, base layer, sportswear