Unique Blend: Made of 60% bamboo fiber and 40% cotton. With this unique blend, this sheet set combines values of the two materials and provides extra softness and comfort. The unique properties of bamboo fiber keeps it warm during winters and cool in summers. Intricate Details: The 500 thread count, solid percale weave creates cool, breathable feel. Double needle stitch makes it more durable. Broad all over stitched elastic inside the fitted sheet makes it snug tightly to the mattress. 16 in deep pocket can fit on the large mattress as well. Wash Care: Machine wash in cold water only. Delicate cycle. No Bleach. Tumble Dry on low heat. Remove immediately after spinning. Press with warm iron if needed. Satisfaction Guarantee: If this bamboo+cotton sheet set does not completely meet your expectations, please return it for an immediate and full refund. Any questions, please feel free to contact us.