Description of Dynafit Zzero 4 PX-TF Ski Boots '09 The ZZero4 PX is the non-carbon version of the ZZero4 C. It is nevertheless constructed in the same way as the carbon version, in terms of comfort, fit, and freedom of movement when ascending. The ZZero4 PX, uses Rilsan® on the Powerstringer instead of extremely-rigid carbon, and this in turn makes it more forgiving in downhill. Ironically, the Rilsan® boot weighs 5 grams less than our stiffer Carbon boot. Compared with other boots on the market, this boot offers top performance and is the lightest 4-buckle Ski Touring boot in the world. The ZZero 4 PX is supplied with a thermoformable Thermoflex inner boot. ? Features: Pebax®, Rilsan PowerStringer: Rilsan Buckles: 4 Magnesium + Power Strap Forward Lean: 15, 21° + release for walking Cuff Rotation: 30° Sole: DynaGrip Ultralight Weight: 1590g (Size 27,5) Binding: Dynafit Quick step-in / UNI Target group: All SkiTourers and FreeTourers looking for the perfect boot in all weather conditions and a more affordable boot than the Zzero 4 C.