This Allison Lane collarless, stand-up neckline with five oversized metal grommets on each side down the front and two small chest pockets are distinctive design. The vest closes with large scale versions of the classic hook-and-eye mechanism. The Rings are prominent circular metal rings on the front of the vest. The denim is a heavy, structured fabric, these fasteners are typically made from heavy-duty brass or steel to ensure they don't bend or pop open under tension. The five-set arrangement provides a secure, gap-free closure from the stand-up collar down to the hem.