Williamsburg 400TC 6-Piece Sheet Set

The good: 400 TC single ply, and for Cal King the flat sheet is 6" narrower and 6" longer than the King - they aren’t lazy and just package a regular king flat sheet with a Cal King fitted sheet.

The bad: made in China, not Egyptian cotton.

It’s so hard finding ones that have actual Cal King flat sheets though… might have to go for one.