Icebreaker built its sporty Sprite Racerback Bra from ultralight merino wool with a touch of Lycra for a great fit. The merino wool naturally deals with odor so you won't feel super stinky on the fifth day of your backpacking trip, and the lightweight merino feels soft and smooth against your skin. This fully lined pullover bra has racerback straps that won't slip, and the soft band gives great support without constriction while you run, hike, and play outside.