 The latest Mercurial Vapor weighs in at 6.5oz.The special features of the boot is that Nike no longer uses the sense studs and four studs for the heel counter now Nike uses a whole new stud design for traction and two studs for the heel counter.This implant of the Mercurials do not include a carbon fibre soleplate, but instead uses the fibreglass soleplate Nike has been using for two years for the standard Vapors.