I didnt get them I just place tubi grip under my sabre hinds now!! And they dont rub which is great as they as excellent and the only boots to give so much protection.
I just use my Prolite front boots (which I got for £25 from a friend who had worn them once!!) or Eskadron front boots on the fronts!
I can use Eskadrons all round for Spider as she is bigger boned but Cruz and Dexter have TB legs to have the Sabres! Hope that helps! Also the Prolite hinds seem quite thin but extremely expensive!