These jackets are generally the cheapest approved jackets available. They are intended for those who may have to wait for rescue, but are likely to do so in a safe position in reasonably sheltered water, say in a harbour or on a river. If you use your boat in rough conditions, you should consider a more sophisticated Personal Flotation Device. This product features closed foam, a synthetic cover, has adjustable waistband and pealess whistle. Meets Australian standards AS5758.1 and AS1512