Use Typekit Font for Main Menu

Hi there, I’m trying to use a Typekit font for my main menu. I’ve managed to get the typekit working, but when I assign a font weight of 400 it doesn’t work.

Here is the page: http://www.shreinmedia.com/

Here is the code I’m using:

#top #header .av-main-nav > li > a {
font-size: 16px !important;
font-weight: 400 !important;
font-style: normal !important;
font-family:”Aktiv Grotesk”,Helvetica,Arial,sans-serif !important;
padding: 0px 14px;}

Can someone please point me in the right direction? Thanks!