The 7-Day Replacement Guarantee at niluscollection.com covers all products sold and provides the option for a refund or replacement within 7 days of delivery if there are any issues with the product such as fitting problems, damages, defects, or any other issues. To initiate a replacement or return, customers can contact Customer Service via email info@niluscollection.com, chat, or by filling out the return form on the website within 7 days of delivery. However, products that have been physically damaged, washed, altered, or are returned without original packaging and accessories will not be eligible for a return or replacement.