The Poseidon life jacket from Baltic is an inflatable life jacket with integrated safety harness. Poseidon. Poseidon is designed to give the user maximum comfort in their life jacket with an ergonomic fit. The valve and cartridge are positioned in a unique way to give the user maximum flexibility and comfort. The Poseidon life jacket has extra good adjustment options and is pretty and flexible. The life vest closes easily with a comfortable padded velcro, which protects from the hard buckle of the waistband. Poseidon has a high carrying capacity of 165N.