From Kassatex, this duvet cover features:

Lorimer Like a perfectly worn in pair of jeans, Lorimer Garment Washed Percale Bedding exudes a sense of familiarity and comfort. The finely crafted solid collection perfects a vintage softness that can only be achieved through the innovative garment-washing process. 

• 60% Tencel/40% cotton
• 300 Thread Count Percale
• Duvet cover features a hidden button closure
• Duvet inserts sold separately
• Machine-wash warm, gentle cycle; tumble dry on low-medium heat; low iron as needed; do not bleach
• Twin duvet cover approx. 68" x 86"
• Queen duvet cover approx. 90" x 90"
• King duvet cover approx. 104" x 90"

Imported.