K2 Sports has bought Zoot Sports, a 25-year-old marketer of performance sports apparel and footwear. Based in California, where it will remain, it is distributed in 22 countries. It markets triathlon apparel for swimming, biking and running, and in November it launched a line of compression apparel that Major League Soccer players, among others, are wearing. Its chief executive, Brian Enge, will continue to lead. Financial details were not disclosed.