pack includes 2 pairs of bikini underwear elasticized cross-front waistband elasticized leg openings sits under belly for your 1st and 2nd trimester fitted xs = sizes 0-2 s = sizes 4-6 m = sizes 8-10 l = sizes 12-14 xl = sizes 16-18 xxl = size 20 model is approx. 5'9" and wears size m (8)machine wash according to the care instruction label .