Why Sleepen Sleepen Mattress selects the best materials for health concerned sleepers 1) Viscose Rayon (derived from cellulose) in our knit jacquard is soft , smooth and ventilating. 2) Swiss engineered HeiQ Viroblock technology provides best of class antiviral/antibacterial /antimicrobial protection. 3) Antiviral efficacy in bedding products withstands 30 gentle washes at 60 ํC. (140 ํF). 4) Sleepen has Oeko Tex Standard100 certificate, the EU approval seal for safe textile. Fabric with Viroblock application is thus safe for human skin and body. 5) Meticulous selection of materials and upholstery layers, powered by Darling Deluxe.