OBrien Mens 4-Buckle Nylon Pro Vest Be fully prepared out in the water with the OBrien Mens 4-Buckle Nylon Pro Vest. This vest from OBrien comes with a total of four buckles, so that you can put it on safely and adjust it for a proper fit. It comes with a flexible foam core design that gives you a high degree of mobility, so that you do not feel restricted. It has big armholes so you can get it in and take it off quickly. It is an ideal vest to take when you head out into the water, to keep you afloat during any mishaps. This vest has an exterior made of durable nylon material, to make it very tough. It is Coast Guard approved, ensuring its high quality. Use this Obrien Mens 4-Buckle Nylon Pro Vest to stay safe in the water.