Doe-N-Heat Gel Urine- Our best selling urine just got better. We took our doe estrus urine and turned it into a long lasting gel for easy use and it last ten times as long. Comes packed in 2 oz jars with screw top lid. Tip: you can place container in a drink hugger with a hand warmer on the bottom. As the jar warms the gel crystals will melt and release smell faster.