100% Polypropylene 1x1 spun rib, fast drying, fabric weight is 5.3 oz. Saddle shoulder, flatlock seam contstruction on tops and bottoms. Crew neck on Men"s & Kids, scallop crew on Women"s. 1" covered elastic waistband on Kids & Women"s, 1 1/4" covered elastic waistband on Men"s.