Sleepdown ribbed fleece bed linen. This bedding set includes a duvet cover and matching pillowcases. Official Sleepdown UK Duvet Cover Set. For a full range of bedding and bedding sets, please visit the official Sleepdown Store. Made in Green by Oeko-Tex, ethically produced in accordance with international regulations is a traceable consumer label for sustainable textiles ensuring the Sleepdown bedding range is.