Locks in wetness with quilted top layer

[kadioguy]

[From the box of a product]

Locks in wetness with quilted top layer
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I think that the "in" should be omitted. What do you think?

 

[5jj]

It would be meaningless without the 'in'.

 

[jutfrank]

If you lock something in, the idea is that it can't get out.