they're probably the same ones that came from the sunlite steel clips i got. they're pretty bad, after each ride i'm fiddling with the clips to get the right tightness. I know you're supposed to cinch them down and loosen them, but whatever. I ride (as I presume most people do) with them at a preset tightness where I can slip in and out and not adjust the straps.

so yeah, either the clips are slipping or it's stretching like no other but there's quite a bit of play after every ride. Definitely gonna go out looking for new straps.