New at Zulily! Jantzen – up to 60% off – make a retro-chic splash! Jantzen has been making waves since 1920. In that same year, the Olympic World Champion in 100-yard freestyle wore a Jantzen tank suit made of 100% wool. The brand has since upgraded their fabrics and expanded their repertoire, but kept the same high quality and commitment to bathing beauties.