Inov-8 is a small manufacturer and will likely run out of stock, but there are other mainstream options: for trail running, get a low-profile shoe like the La Sportiva Crosslite; for asphalt, use ‘racing flats’ like the New Balance 205.
Source: Tim Ferriss, The 4-Hour Body – Ultraendurance II
Amazon.com Price: (as of 2018-08-16 02:25:11 GMT)
Product prices and availability are accurate as of the date/time indicated and are
subject to change. Any price and availability information displayed on Amazon.com at
the time of purchase will apply to the purchase of this product.