All upgradeable individual packets can hold up to 48lbs. Mid-chest belt for maximum hold no bouncing and no shifting. Increments of 3Lbs. One Velcro belt included. Weights are loaded at top body front & back for optimum performance. Machine washable and dryer also, first of its kind. No Sweat Defender Accessories Needed. One size fits MOST, for both men and women. WEIGHTS ARE NOT INCLUDED