They dry faster than a speeding bullet or any other undie we’ve tried. They pack down tiny. 2 pairs can navigate 15 countries in 6 weeks. They wick and breathe and, most importantly, they fit fabulously. They are WunderWear! Nylon/spandex. XS(2-4), S(6-8), M(10-12), L(14-16), XL(18).