The "December 2021 Back in Stock" page allows retailers to easily glance at restocked inventory on a monthly basis. This can help determine seasonal sunglass trends, popular colors, stylish embellishments, etc. Retailers can choose to sort by price, brand, sunglass style, gender and features to easily locate specific sought-after models. Every time inventory is back in stock, this page is updated to reflect the latest information. Retailers are advised to check back frequently, as these pages are updated often.