Very nice and sleek looking webshop. May I ask which template you use?
The layout and design in mobile views are excellent. Just a little feedback: In the cart, when filling in the adress, the view does not jump to the error message when something is missing, but stays down at the bottom. This might confuse some customers that expect the error message to pop up, or the screen to scroll to the relevant message. I guess this is something due to Hikashop itself. Also, the social sidebar pops up on mobile view, which is not necessary given the social bar at the bottom.
Again, great work!