Does the mattress need to be kept in a plastic wrap during the trial? May 08, 2019 11:14 Updated Follow Not at all! Feel free to dispose of the packaging and use your Simba Hybrid® how you usually would. Related articles How does the 100 night trial work? What does the mattress 10 year guarantee cover? Do I still qualify for the 100 night trial if I paid using financing? Does the 100 night trial apply to all Simba Products? Is there a guarantee for the pillow and Simba bedding?