As X Factor finalists One Direction left an interview at BBC Radio 1 a smitten fan screamed at them 'Why you so fit?' and coined a phrase which became a running joke at BBC Radio 1 and later that day trended on Twitter WhyYouSoFit. Never one to miss an opportunity, our on the pulse designers have created this fabulous ‘Why you so fit’ t-shirt and with the first printed t-shirt sent to Radio 1 presenter Fearne Cotton.