These 2.5 LB Additional Weight Bars are designed for use with the Titan Weight Vests (sold separately) so you can dial in the perfect resistance by adding or removing increments. Whether you are walking, running, doing bodyweight exercises, lifting weights, riding a bike, or simply doing chores around the house, the weight vest will add another level to your workout. You will burn more calories, build muscle, get faster, and will keep burning calories during the day because the more muscle you have, the more calories you burn. The added foam padding in the shoulders and vest body ensures your comfort by relieving pressure and making it breathable. Great for police, firefighter, and military training.