Abstract: A retention strap assembly for a buoyancy module in a riser system, the retention strap assembly comprising: an elongate strap member comprising connection points at opposite ends, the strap member configured to wrap around the buoyancy module; a buckle member comprising connection formations configured to receive the connection points of the strap member, wherein the buckle member further comprises a tensioner configured to tension the strap member, the buckle member being configured to tension and hold the strap member around the buoyancy module; and a plurality of attachment formations spaced along a length of the strap member, each attachment formation comprising an attachment point configured for attachment to auxiliary riser equipment. The connection points of the strap member may be provided by ends of the strap member being looped or folded over. The strap member may comprise at least two overlapping layers.