Hi Angela,
 
Thank you for your question. If you purchased a mattress topper in a box then it can take some time for them to fully expand. These toppers are rolled and squeezed so that all the air is expelled and then vacuum sealed for transport.
 
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If you purchased a mattress topper from ourselves this does not generally happen as they are transported the same way a mattress is. This being said, if stood on it's side for some time could make it crease, in this case lying it flat should solve the problem.
 
I hope this is helpful and if you would like any further information please do not hesitate to contact the office on 0161 437 4419.
 
Kind Regards
Michaela