Mattress Covers And Sheets

[Cat320]

How are the mattress covers and sheets secured to the bottom of the king beds? With the corners of the beds rounded off, seems they would be wadded up in a bunch being all stuffed underneath the mattress.

Do they sell mattress cover and sheets with the rounded corners?

[Bobcat]

I make bed just like I always do and no problem. Fitted sheets are a little loose but do not seem to be a big problem. I have a two inch memory foam mattress and a flat pad, this takes up some of the excess sheet.