Made for long term use (will resist to dozens of washes) Removable Nose Wire Included Preshrunk (will not shrink when washed) Fitted to face (5 sizes; XS to XL. XS = children 3 to 6 yo, S = children 7 to 12 yo, M = small adult face/teenager, L = average adult face , XL = large adult face ; if you hesitate between two sizes, go for the bigger one. See size chart) Double layer of heat-treated highly stretch poly interlock (100% Polyester)