An evolution of Xero's best selling road running shoe, the HFS II is even more comfortable, and more stylish. While you could call it a road runner, you’ll do so much more in it. Like the original HFS, the HFS II is super lightweight (6.7 oz for a women’s 7), so you’ll feel like you’re flying down the road. And with a new tire tread-inspired outsole, you’ll feel secure even if you go off road. The HFS II sole looks thick, but it’s an illusion - there's a thin BareFoam™ layer for extra protection that wraps, cup-like, around the upper giving the HFS II a more familiar-looking profile.