Calvin KleinSling tube

During check-out, you can opt for an Authenticity Certificate in partnership with Entrupy, the world's first and only on-demand authentication solution.

The item you bought will be shipped first to us first, authenticated with Entrupy technology. Upon confirmation, an official Entrupy certification document will be printed and shipped to you with your purchase.

With our unique service, your purchase is not only authenticated for lifetime but you will also guarantee the value of your item if you decide to resell.