It's this website real ?

[SimonC]

Clearly not selling the genuine article.

I have not checked the WHOIS, but other answers have said the domain is registered to China, which is one indication

Another is the use of language. The domain itself is "mans...". This should be "mens...". Look at the shipping page - the use of English there is also pretty poor.

Another indication is the site itself. "Designer" brands like Barbour do not have "hot sales" or "discounts". They will reduce prices, but maintaining a quality image is key. So use of these terms definitely indicates a dodgy site.

Finally, if prices are too good to be true, then they are not true. Simple as that. Only the greedy get caught by sites like these.