Pure Duvet Cover Sateen Clay from the Swedish brand Magniberg is a duvet cover made of silky smooth and luxurious cotton sateen. The Pure collection of bed textiles is an elegant and minimalist series of duvet covers and pillowcases that have as few visible stitches as possible. This is to contribute to a sense of calm in the bedroom. The duvet cover consists of 100% supima cotton woven with 500 threads. The duvet cover has a mercerisation treatment for cellulose fabric and yarn which improves color absorption and tear resistance, reduces shrinkage and gives a silky finish. The fabric also has a softer feel. Pillowcases are not included but can be purchased in several different shades.