My king size divan mattress weighs a ton and it's really hard for me to move alone so the fact this just stretched right over it to fit without taking the mattress off was great -  takes a little bit of tweaking to make it sit neatly all the way around (especially as my base was pretty much the max height this takes) but straight forward to use and has brightened up my divan base nicely and much sleeker than a traditional valance.