Xero Shoes HFS - Women。HFS II – A New Take On Our Most Popular Road Friendly Running Shoe.​ An evolution of our best selling road running shoe, the HFS II is even more comfortable, and more stylish. While we call it a road runner, we know you’ll do much more in it and can’t wait to see the pics of where it takes you and what you do. HFS II is a high performance road running shoe that’s so comfortable you’ll wear it for pretty much everything else you do. A stylish update to a classic Xero Shoes road-runner Lightweight, grippier and comfier A new tire tread-inspired sole