Made of 'supima' cotton, this sheet has a 550 thread count and is soft to the touch and has a sateen like surface.  'Supima cotton is a superior type of cotton grown in the USA. It represents less than 1% of cotton grown in the world. What makes Supima unique to other cottons is the extra-long staple fiber that gives the cotton its premium properties: Strength, Softness and Color retention'.