As long as you have some room
As long as you have some room in the VFFs, the socks should work well. If your VFFs are already a bit tight, there will be no room for your feet to swell, as is normal after about three miles of running.
If you need the traction, have you thought about the VFF Treks? Check out the 2010 Minimalist Footwear Review & Buyer's Guide for more info on the Treks, as well as some other minimal footwear options out there: http://www.barefootrunners.org/images/barefoottj/Run%20Free/MinimalistFootwearReview.pdf
As long as you have some room in the VFFs, the socks should work well. If your VFFs are already a bit tight, there will be no room for your feet to swell, as is normal after about three miles of running.
If you need the traction, have you thought about the VFF Treks? Check out the 2010 Minimalist Footwear Review & Buyer's Guide for more info on the Treks, as well as some other minimal footwear options out there: http://www.barefootrunners.org/images/barefoottj/Run%20Free/MinimalistFootwearReview.pdf