Helly Hansen Women's Long Sleeve Top,Dusk,Medium 100% Polypropylene LIFA is our versatile performance base layer that functions as a second skin to keep you dry and maintain stable body temperature The fine filament polypropylene yarns used in LIFA are lighter weight and less absorbent that any other natural or synthetic fiber for use in any activity where moisture transfer is necessary to remain comfortable Machine wash low hang dry no bleach do not dry clean or iron 100% Money Back Guarantee (see PDF linked in Product Details below)