Nautica's cotton percale sheet sets are available in an array of additional Nautical designs and solids. These 200 thread count sheets will add an extra layer that is cool to the touch. Breathable and lightweight, this cotton construction is perfect for long-lasting comfort. Each sheet set includes one flat sheet, one fitted sheet, and two pillowcases one for Twin and TwinXL sizes . The fully elasticized fitted sheet prevents slipping from the mattress and ensures the perfect fit. This set fits mattresses up to 15"" deep 12"" deep for Twin size .