Spuncrylic is made of polyester yarns and Sunbrella is made of acrylic yarns. Both fabrics are solution dyed, which means the colors are saturated throughout the entire yarn, making them highly resistant to fading. Both fabrics are stain and mildew resistant and they are also water repellant. Both fabrics have a UPF (Ultraviolet Protection Factor) of at least 50. Spuncrylic fabrics have a 2-year warranty against fading and Sunbrella fabrics have a -year warranty against fading.