With İts Special Outlast Fabric, One Side Gives A Feeling Of Coolness And The Other Side With Red Stripes Gives A Feeling Of Heat; A Special Duvet Offering The Naturalness, Lightness And Softness Of Goose Down. The Combination Of Goose Down, The Most Natural, Healthiest And Softest Filling Material, And Outlast Technology Allows You To Feel Superior Sleeping Comfort. Your Body İs Exposed To Temperature Changes During Sleep. Your Body Naturally Releases Excess Heat To The Environment And Sweats To Cool İtself. Outlast Technology Traps This Heat With İts Patented “Thermocules”. As You Begin To Cool Down, The Trapped Heat İs Returned To The Body, Creating A Comfort Zone For İdeal Sleep. Heat Value: Medium / Warm. Filling Material: 100% Goose Down; 90% Down Feathers, 10% Back Feathers. Filling Material: 100% Goose Down; 90% Down Feathers, 10% Back Feathers. The Blue Piping Side Of The Thermy Duvet İs 100% Outlast Fabric, And The Red Piping Side İs 100% Cotton Fabric.