Whether you're rocking a y2k outfit or just want to add a touch of nostalgia to your style, these shield glasses are the perfect finishing touch.The Y2K Sunglasses Trend. Y2K sunglasses, inspired by the early 2000s fashion, are defined by their one-of-a-kind designs and vivid color schemes. Learn about the Y2K sunglasses trend, its key features, and how to embrace it with Y2K inspired Zenni eyewear.