Are the yellow ones the latest ? Or older ?
I got some, almost black and with a bit of white stripes - from around 2010.
They stick perfectly, and have never slipped
Same principle - a strap hanging out from the centre, and you push hard on the buckle to loosen.
Not that easy to adjust (loosen), as they can get stuck if not used - but dont mind, as how often do you adjust your straps ?
Two times a year for many, going from summer to winther (barefoot to booties) and back, and if travelling in the winthertime.
Thats not often, so would always prefer they were difficult to adjust, and maybe not easy to adjust.
But loosening up when riding ? That must NEVER happen
So if their latest, I hope they have stopped selling these, or modified so they work