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? How do I start a return? Will I be charged for the mattress topper if I return my Helix? How does the return process work? What is the Break-In Period?