About Dynafit 04 PX Women's Ski Boot: Hey, I'm Tim from Dynafit. I'm here with the Zzero 4 PX women's. This size 25 is the lightest four-buckle boot on the market. Women appreciate lightweight. Lightweight, as well as these quick step-in inserts that allow you to step into a Dynafit binding without even looking. Drives you right into the bindings using the quick step-in grooves. Zzero 4 PX is ideal for women for various reasons. Lightweight must be felt to be appreciated. You can go up the mountain with minimal effort. And then when it's time to go down, this is a very powerful boot. Dynafit actually changes the shell to make it women-specific. Many people will just change the liner, to help women out. But actually modifying the shell, to make it wider and lower in the back, to give room for the calf area, and the calf muscle, will take a lot of pressure off your calves while your touring. This is a very comfortable, very powerful, very lightweight boot that you'll appreciate when you get into back country skiing.