Natural Movement Design: Barefoot + minimalist principles with a wide toe box for natural splay, zero-drop for proper posture, and flexible, low-to-the-ground sole for a connected, natural experience Lightweight Performance: Performance road running shoe Supportive Fit: Breathable mesh upper with moisture-wicking lining Added Protection: Welded overlays for lightweight protection & durability with internal tenstioning strap system for a secure lockdown & support Durable: Dual chevron lugs for traction on the trail and beyond 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 running shoe, 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 if for pretty much everything else you do.