How to change the font that appears in product selection drop down menu

Site URL: https://www.rockymountainfleecewear.com/

The font that is shown in the drop down menu for each of my products is sort of blah and doesn't really match the style of the website. how can i change this? 

Can you share link to a product page?

https://soybean-sparrow-wknj.squarespace.com/rmfshop

11 hours ago, RMF said:

https://soybean-sparrow-wknj.squarespace.com/rmfshop

Add to Home > Design > Custom CSS

.variant-option * {
    font-family: freight-sans-pro !important;
}

thank you!!!