The X4020 The Xvest model X4020 comes with twenty (1) pound weights, with a maximum weight of forty pounds. The vest has a D-ring front and back for Multi-plane resistance training. The Xvest is also treated with Anti-bacterial and Anti-microbial agents to fight against cross-contamination and malodorous odors. The Xvest can be utilized on dry land and in the pool. With the weight resistance adjustable in one-pound increments you can incorporate the Xvest in your speed progressions, agility drills, Plyometric progressions, cardiovascular conditioning and body weight exercises.