On the site I right clicked on the side of the screen (on the site background) from the list I chose view page source and a new page opens that shows the source code for the page near the top is the css that shows a link for fonts clicking this will open another page that lists all the embedded fonts used in the site. The body text you are after is as I thought Helvetica Neue.

The bad news is it is not cheap. Helvetica Neue