The ultra-light Icebreaker Wmns Siren Hipkini is sporty and beautiful. It is made from the finest merino wool with a touch of nylon and elastane. The merino fibers encase a nylon core to make the fabric even more robust, while maintaining the soft feel against the skin. You'll feel really comfortable in it: it's soft on the skin, doesn't itch or scratch and the elastic, plain-colored waistband makes it a favourite for underneath.