You Wear it Well... The X2 Vest As seen on The Today Show. One of the most effective opportunities to enhance your workouts today. The X2 Vest allows you to add weight to your core in one-pound increments. The X2vest can be used by anyone of any skill levels and all body types. It is the most versatile sports training and fitness tool on the market today as it maximizes your current fitness program, strengthening core muscles and improving spinal bone density associated with aging.