This is the initial state of the webpage...
And this is the webpage with the promotions and menu bars remaining visible jointly at the top...
Presumably, the feature is being tested out on Gilly Hicks before any of the other brands online which have yet to have the feature. It helps make the online experience – moving about and exploring – more instantaneous and keeps promotions and offers always in sight for the shopper! You like? Try it out for yourself at gillyhicks.com! ;)
Stay FIERCE!