Abstract: A secure fastener for use with divers' hoods comprises a post assembly (3000) and a latch assembly (2700). The post assembly comprises an inner post (2555), an outer post (3015), and a locking pin (2900). The inner post is placed inside the diver's hood (125). A hollow column (2567) on the inner post passes through a hole in the hood material. The outer post is joined with the inner post via the column. The column contains recesses (2565) that mate with an inner ridge (2550) on the outer post (3015). It also contains cuts (2570) that relieve the column walls and allow the inner and outer posts to slidably engage. The inner and outer posts are forced together, engaging the ridge with the lowest recess on the column. A locking pin (2900) is then inserted into the column, preventing flexure of the column walls and locking the two halves of the post assembly in place. The post assembly is thus able to accommodate different wall thicknesses encountered in diving hoods.