The MD3025 fits around the waist like a belt. When immersed in water, the wearer inflates the pouch by pulling as activation cord. When the cell is inflated, it must be pulled over the head for proper use as a flotation device (Canadian equivalent model: MD3021). Use only Mustang Survival re-arm kits. Use of other re-arm kits may result in improper operation or failure to operate and will void the product's warranty. Features user inflates PFD by pulling activation cord lightweight and compact design allows unimpared movement provides 35lb buoyancy when inflated and fully donned (correctly pulled over the head) capable of self-righting a face-down person in seconds