Xvest X8484 The Firemen Model 84-Pound Weight Vest The xvest is made of a 400 denier nylon The xvest is made of a 400 denier nylon |Individual weight pockets give you complete control and stability of the weight|Quad-Lateral elastic torso straps with hook and loop closures; adjustable shoulder straps with hook and loop closures|The two-piece clamshell design of the Xvest is based on orthopedic devices that aid in the proper spinal alignment and support|