If I return my mattress, do I also return the topper? January 29, 2021 19:04 Nope! The complimentary mattress topper will be yours to keep if you decide to return your mattress within the trial period. Related articles What is the Helix Mattress Topper program? Will I be charged for the mattress topper if I return my Helix? How do I start a return? How does the return process work? What is the Break-In Period?