Well it may not actually mean have a nice day but it makes its point in a humorous way.
New shirt? Nice! We want you to be happy.
If you're not, we want to make it right.
That’s why our apparel products are backed by our PerfectShirt Guarantee.
If for any reason you're not smiling from ear-to-ear,
you can return or exchange your purchase within 30 days - even if it's personalized.