Technically advanced high frequency welded Fighting Sports TPU urethane bladder is built to last 10 full years of everything you can dish out and more. The bladder is sandwiched by 3" of high and medium density shock absorbing outer foam for superior protection, comfort and one-of-a-kind feel when punching, kicking and striking the bag. The exclusive ShockWave™ water filled system takes heavy bag training and workouts to the highest level. Ideal for all gyms, training centers, schools, institutions and home use. The triple reinforced outer shell is covered by a heavy duty vinyl coated poly canvas and complete with cross poly propylene webbing reinforcement at the base and hanging straps for professionally built workouts. The ShockWave™ Water & Foam Heavy Bag is highly recommended for all your training demands from world champion to fitness freak. Every ShockWave™ Water & Foam Heavy Bag has a full 10 year warranty on the bladder. Ships unfilled.