100% nylon velcro tape Completely washable and dry cleanable.Shrinkage-maximrm 1-2%. Easily attached by sewing,glueing,Ultrasonic or heat sealing and by many other methods. For best results,mate tapes when ironing.Hand ironing do not exceed 121 degree Melting temperature 248 degree Most oils do not affect closure strength.Retains sufficient closure strength in water. 100% nylon velcro tape