Mesh shoulder, back and sides to keep you cool a Lightweight and durable flotation foam a Durable nylon construction a Two 1" encircling belts with a heavy-duty zipper closure a Hidden belts to reduce snags a SOLAS grade reflective material on front and back a Contrasting stitching on belts for more efficient vessel checks a Compatible with Radio Pocket #1519 a Minimum 15.5 lbs. of buoyancy