Casper mattresses are compressed during shipping and may need 24 to 48 hours to fully expand.
You may sleep on your new mattress after unboxing it, but it may not be as comfortable as you’d expect. Plus, it may have a strong odor for seven to 18 days, depending on the model.
Given these aspects, it’s best to place the mattress in a cool, well-ventilated room until it reaches its full size. It will begin to expand immediately and will look full-size within just a few minutes. Full support levels will be reached within 48 hours.
