Like the title says, I cannot find any sheets that fit well on a split king with adjustable base. My fitted sheet on each twin XL comes loose every night and it’s causing me to lose sleep.

Does anyone have recommendations on a sheet set where the fitted sheet fits well with an adjustable base.

For reference, I have a bear elite mattress with temper-pedic adjustable base. The mattress is 14 inches thick.

I have found just a few. What I’m looking for in a split kind is the twin xl fitted sheets and the large king sheet (and pillow cases, etc) because my husband and I bought a split king and the bed is adjustable.

I really like flannel for the winter, but one I found online is just plaid and not the soft brush flannel feeling. I’m not wild about the design of the print.

I like the way linen looks but I’ve never had linen sheets. Mainly I want flannel sheets (I do like plaid, just not the one I ordered as it’s very bold) and I am curious about linen.

Editing to add, the one I ordered is by Bare Home and it’s ok, but not the soft brushed flannel like I want and not wild about the pattern like I said. I’ll keep it if I can’t find anything else. (I LOVE cuddl duds flannel sheets, but no split king)

Does anyone know of any brands or websites that I would find split king sheet sets? I actually don’t see a lot even for twin xl, which I’d rather not get anyway.