The Naturepedic Organic Supima Cotton Sheet Sets strong and woven from the world's rarest cotton, Naturepedic's Supima sheet sets embody understated luxury in its softest, most enduring form. A 300 thread count woven with a two-ply weave creates a 600 thread count feel - silky to the touch, strong in structure. Materials: Organic Supima cotton grown in the USA. Weave: Three-over-one-under sateen weave for supreme softness and a subtle sheen. Thread count: 300 thread count with double-ply yarns that mimic a 600 thread count feel. Nontoxic integrity: No harsh chemical fabric treatments like formaldehyde resins or heavy metal dyes. Screened for 15,000+ toxic substances. Breathability: Organic cotton’s breathability allows for cooler, comfier sleep compared to polyester or rayon Standard Set Includes: 1 fitted sheet, 1 flat sheet, 2 pillowcases. Naturepedic Certifications: Certified Organic by the Global Organic Textile Standard Certified Organic Latex by the Global Organic Latex Standard Certified by the Organic Exchange OCS100 Certification Program for Organic Content Standard Certified Non-Toxic by MADE SAFE UL/GREENGUARD Gold Certification for chemical emissions testing Certified for the Forest Stewardship Council