Asics Gel Noosa Tri 7 is a racing flat that features a non-collapsible heel counter, an inflexible forefoot, and torsional stability. Although these features are not typically found in racing flats, they can really make a difference for the midfoot and forefoot striker.
The only issue with this shoe is the shape (last) is more C-shaped than rectangular. The last shape — coupled with a waist that hourglasses in — can cause excessive pronation in certain foot types, as the following field review video shows.
Dr. Jenny Sanders Shoe Blog 