Lance Armstrong Dropped by Helmet Company

A rep for Giro Helmets tells TMZ, "We will not be continuing our sponsorship of Lance Armstrong moving forward. We continue to support the cancer community through our association with LIVESTRONG."

Giro's not the first company to boot Armstrong -- Nike announced it would no longer be sponsoring him either, claiming Armstrong "misled" the company for more than a decade.

FYI -- the U.S. Anti-Doping released a report last week, detailing Armstrong's direct involvement in what it called "the most sophisticated, professionalized and successful doping program that sport has ever seen."