FAQ THE SHEETS WHAT IS PERCALE? VOIR TOUTES LES QUESTIONS WHAT IS PERCALE? Percale is a weave fabric that is incredibly breathable. Percale sheets provide cool, crisp comfort that only gets better with time — which is why we chose this fabric for our Cool Supima® sheets. VOUS AIMEREZ AUSSI What is Supima® or Pima® Cotton? Can I review the sheets? Do you make custom size or RV mattresses?