ATI Weighted Vest Includes 10 lbs. of Weight and Can Hold a Maximum of 35 lbs. (Additional Weights Not Included) Helps Develop Specific Muscle Groups to Enhance and Increase Speed, Quickness and Lower Leg Power by Strengthening Hip Flexors, Knee Joints and Quadriceps Constructed of Anti-Bacterial and Anti-Microbial Treated Lycra and Neoprene to Eliminate Chafing and Movement on the Body One-Piece Design with Detachable Sleeves and Lower Section Use to Increase 40-yd. Dash Time by 2/10th of a Second and Increase Vertical Jump 5-10 Inches!