The all-new Vapor Hyperlite 2 skate line is built for ultimate quickness and agility. Vapor skates feature stiffer and more supportive material in the upper portion of the skate, and increased flex and responsiveness in the lower part of the boot. A couple of big upgrades Bauer put into the X4 include the Pro Stock tongue, CURV Composite and LS Pulse Stainless Steel.