I am not sure what to say. I ordered these shoes but was sent the Dynamite-300-1 instead... and those came with a threading defect. I am still awaiting a refund and hopefully, as promised, I won't be charged a re-stocking fee. I did order a new set of Dynamite-300-1, since they were on sale. They arrived swiftly and were awesome. I wear a size8.5 wide and got a 9. They fit well, and had enough lacing to accommodate my calves and thighs without gaping or bulging. The only difference I can tell between the 300 and 300-1 is the position of the zipper; but perhaps the Dynamite- 300 has a sturdier fabric, as the material looks more substantial in the pictures. Over all I am satisfied with my purchase.