My duvet has loops, but my duvet cover lacked ties. I used narrow bias tape to make ties. Cut it to length; knot the ends; fold in half and hand stitch to each inside corner of the cover. It's a 10 minute job tops.

I do the same as Delilah. I also add an extra one or two loops and ties toward the center of the comforter and cover. It helps to keep it all in place.

The item you linked to for insert says it is a duvet cover, not an insert. I buy narrow elastic, a package is very inexpensive, cut about 12 inch pieces and fold in half, stitch at the fold to the inside corner of the duvet and tie it to the loop of the insert corners. That allows movement since it is elastic. Always works. I doubt any of the linked items will work perfectly.

Like Sushipup1, I've never needed anything to keep my duvet from shifting inside the cover. However, neither of us are restless sleepers.

I used to use clips but I use either the ties or nothing now and for the last 15 yr. My duvet/covers are queen size though-- it might be helpful to use clips or magnets to help with assembling a king duvet and cover.

Goodness this wouldn't post earlier and I didn't know it went through.

I looked and my PB duvet does have ties. Rejoice.

Hmm...I see the link does say it's a duvet cover but I'm not sure why. It looks like an insert to me and reviewers are saying they use it in a cover. Description is calling it a comforter duvet.

I can sleep in the same position all night but DH is a cover wrecker. If he's in bed after me they're twisted and folded and turned....

I was digging around earlier and saw about sewing ties. Great idea. I think I may even have elastic or shoe strings around here. I'm not going to get the magnetic ones.

Little cutie locked himself in the bathroom bright and early this morning...and we have safety door knob covers. - #1 or #2? How old are they now?

I am a duvet newbie too. I used the foam clips at the 4 corners and one or two on all 4 sides. So far they are holding and they are not noticeable.