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Hello - both of my boys are playing Lacrosse and I noticed serveral competing teams recently using high purity oxygen during the games. I’m assuming this is legal. Does anyone know? It appears to be the same concept that pro football players use on the sidelines. However, this is a product call Big Ox O2. I haven’t seen it until this year. The Lacrosse players are huffing it down on the sidelines. Is anyone familiar with Big Ox O2? If so, can you please tell me how well it works. I considered buying it for my sons, but I want to be sure it works first. Thanks.