Madison Park's 600 Thread Count Pima Cotton Sheet Set is built from 100% extra-long-staple Pima cotton — one of the rarer grades of cotton grown, prized for fibers long enough to be combed smooth before weaving instead of left short and uneven. Fewer breaks in the yarn means a softer hand feel and less pilling, wash after wash, not just out of the bag. Woven in a sateen construction, the fabric carries a subtle, lustrous sheen that only gets smoother with use. A single-line Baratta hemstitch runs along the hem, adding a tailored, couture-inspired detail while reinforcing the seam for lasting wear. Every piece is OEKO-TEX Standard 100 certified, tested against harmful substances so it's safe for the whole household. The fully elasticized fitted sheet is cut to comfortably fit mattresses up to 17" deep.