Hmmm...that's very interesting because my heaviest day is always day 2 of my period and I rode a 100-miler on that day this month...never even came close to having an "accident". We always make a few potty stops at gas stations on longer rides, so I make sure to change my tampon at each stop and I always carry at least 2 extras with me on my heaviest days. Sorry you had a not-so-pleasant experience...and hope your chamois wasn't ruined.