What does the "90" on nike gear mean?

Dear icemaninc-ga,

I assume you mean these products. If so, then they are all football
products and it refers to the length of a football match: 90 minutes.
http://images.google.co.uk/images?svnum=10&hl=en&lr=&q=%22total+90%22&btnG=Search

Many of these products come with these sales pitches based on the 90
minute game, ?The ultimate professional-level boot for players
performing at their best for 90 minutes.? and ?Designed for the player
who wants to perform at their best during 90 minutes?.

answerfinder-ga

Search strategy
Personal knowledge of football
nike "90" "trademark"
nike "total 90 "
nike "total 90 " "90 minutes"