These are a pair of clips that I made from some cheap WindTech (name?) clips. Literally $5 clips. I cut the more rounded-over feature, and then drilled them to fit an elastic band and cinch collar. I added some adhesive backed foam to support the mics. The elastic cord draws softly but snugly onto the mic and holds it solidly. They treated the DPA 4028 compact series very well.
Cheap and simple.