Add more weight resistance to your UniVest weighted vest with this compatible package of 10 qty. 0.5 lb. weights. UniVests are capable of supporting double the weight of the base model, i.e. the 10-lb. weight vest can increase weight to 20 lbs., and the 20-lb. weight vest can increase weight to 40 lbs. Fast shipping to the lower 48 United States for this package of additional weights.