Out of the box, the cirrus are true to size. I'm a true 10.5 and decided not to size down. I only have about a month on them so I'll have to wait til next year to really see how much they pack out. Theyre a medium flex that still have enough support to rip steeps, but not so stiff that you can't set it down on rails. The CLS are a notch lower on their stiffness scale so it'll prob be a very versatile boot.