Modest Sleevies Sleeve Extensions 90% Natural Viscose/10% Lycra Sleevies an original Kosher Casual design enables any top to be converted to a 3/4 sleeve shirt Grabs the upper arm comfortably yet firmly with an elastic band located at the top of the sleeve. Change your entire wardrobe for less than the price of a single shirt! See size chart in images for best fit. Elastic is approximate because it is stretchy. Imported. Machine was cold.