The package option offers a wide variety of combinations. If you are buying a package and would like for our staff to match compatibility, please write in the comments section of the checkout what items you would like for us to match up. Please do this for ANY package you buy. For example, "Please match the k2 four 167 cm with the Nordica F5 size 27.0" This will ensure that the boots are compatible with your bindings. PLEASE READ THE FOLLOWING SENTENCE, VERY IMPORTANT! You still need to get the bindings release checked by a certified technician before using them. We are only testing the compatibility for you. We are not adjusting the DIN settings.