Sunguard+ UVR bonded polyester thread goes through a state-of-the-art twisting, bonding and dying process to ensure the highest quality of colorfastness and performance. It provides protection against cleaning chemicals, UV rays and seam leakage. It is resistant to mold, mildew, chlorine and bromine. Added nanotechnology prolongs the life of the thread outdoors and helps meet anti-wick standards. Available in 36 shades.