For a step above, the 600 thread count of the excellence collection gives you an even softer, silkier feel.And because we use the same extra-long-staple Egyptian cotton, you get sheets that look newer for longer.Buttoned up: all our duvet covers come with buttons, bigger than the usual and harder to come undone.Fully covered: all the pillowcases are envelope encased ensuring your pillows don’t escape.No escapes: all fitted sheets’ elastics are fully grippy. No more 3 am bed making.