Winter diving in cold water is the worst, when you ascend from the "warm-ish" bottom at 50F past the thermocline and hit the 40F water in the shallows. I can usually do a 60 minute NDL dive without peeing, but just barely and sometimes painfully so, and only if I make sure to pee right before I splash. So glad I don't have to deal with that anymore. I don't even want to imagine doing deco in those conditions without a p-valve.How in the world can you do a 1h30m dive in cold water and not have to pee?! Are you sure you weren't dehydrated? I can't do a 30-minute dive in warm water and not pee let alone 1h30m in cold water. Immersion diuresis hits me hard. Is it that variable person to person?