The Elements 10kg Weight Vest can be adjusted from 0 to 10kg using the 10 included 1kg iron blocks. The design is comfortable and the materials are durable. The design allows the weight vest to be used for a wide variety of activities; callisthenics, such as pushups, pull-ups, squats, dips; running; cross training etc. One huge benefit of this vest is that the shoulders aren't so wide that they cut into your shoulders when doing pull-ups - a common problem with other weighted vests on the market. The vest fits snuggly to your body but still allows you to move freely! What's in the box Weight Vest and 10 x 1kg Weights