100% Cotton Percale - Naturally breathable and durable. 400 Thread Count - Ideal balance of softness and longevity. Temperature-Regulating - Tight percale weave promotes airflow (no heat trapping). Deep Pocket Design - Fits mattresses up to 18" (fits most pillow-top mattresses). True Grip fit technology for snug fit on mattresses from 7" to 18" deep pocket. Fitted sheet comes with a head/foot tag for easy identification of the sides. Pillowcases feature open-end closures to slip in and take out pillows effortlessly. Made in Green and STANDARD 100 by OEKO-TEX® for credible safety and reliability