Great design but not held together very well
I bought these to replace the strap on my son's dilli dalli frames.  They fit on the frames very well, however, due to the way the plastic clips are it does make the strap a little longer than the original.  The only problem I have with these straps so far is my son (who is 3) likes to pull his glasses off and when he did it with this strap part of it came undone (see photo).  I can easily sew this back together so it's not a huge deal.  I already had to sew it a little to make the strap shorter as the shortest length wasn't enough.
Rating: 4 stars