Waivers is a National Football League labor management procedure by which a team makes an American football player contract or NFL rights (such as NFL draft rights to an unsigned player) available to all other teams. During the season (starting July 4 and lasting through the regular season), each team has 24 hours to file a claim for a player that another team has made available through the system or waive the right to do so. During the off season each team has several days to file such claims. Claiming teams are assigned the rights to or contracts via a priority system based on inverse order of winning percentage. Players that pass through waivers unclaimed become free agents. Waiver claims are irrevocable.