Sea Cell - Time To Relax - Sheet Set - "The Feel Good Sheet with the Power of Seaweed!" 75% Cotton ~ 25% Seacell (Queen Ivory) 75% Cotton/25% SeaCell SeaCell fibers contain mineral rich, certified organic seaweed (ascophyllum nodosum). SeaCell fiber features an active nutrient exchange with the skin providing a long lasting effect of well-being and protection against damaging environmental influences. Seaweed is known for it's anti-inflammatory, skin protecting and caring effects, which is promoting a purified and restful nights sleep.