The Soft Flex Water Bag from Everlast uses a unique, patented flexible foam outer casing combined with a soft, water filled inner bladder to provide the most realistic feeling bag on the market today. The flex-foam outer shell works in conjunction with the water-filled bag to provide the perfect amount of resistance, weight, rigidity and impact absorption. The natural give of the Soft Flex Water Bag means that there is little or no sway, even after powerful hits, making this bag the perfect tool for training and practice.