100% European flax. STANDARD 100 by OEKO-TEX® certified: Tested in a third-party lab and verified to be safe from over 300 harmful substances. Melange: Woven using two different yarn colors, creating beautiful depth. Solid: Woven from the same yarn, for minimal color variation. Set: 1 flat sheet, 1 fitted sheet and 2 pillowcases (1 with Twin/Twin XL). Pillowcases are sold as set of 2. Fitted sheet fits mattresses up to 16" deep. Twin XL sheeting has a longer fitted sheet to accommodate both standard Twin and Twin XL dorm mattresses. Made in a Fair Trade Certified™ facility, benefiting the workers who make it. Linen woven from European-grown flax, constructed in China.