My husband and I bought new split king adjustable mattresses a few months ago and the sales lady told us that we would have to just buy XL Twin size sheets for it so when I found this set of sheets not only made for a split king but also with deep pockets and extra wide top sheet I was thrilled.  We have had them for a couple of weeks and they wash well and most importantly they stay on the mattress and my husband and I aren't constantly tugging on the top sheet to stay warm.  I would highly recommend these sheets and I thought they were a good value!