Freshness, quality and effectiveness are guaranteed! These natural urines come from moose at the Buck Expert research center, they are fed with the same diet as wild moose. For maximum results, use natural urine at your salt licks, bait sites and while calling. It is recommended to keep the urines between 33 °f and 41 °f. For best results warm urine to body temperature in your pocket before use. Quality urines are bottled early in the season and hold enough preservative to guarantee effectiveness.