I agree with the evaporative heat loss observatrion. A we neoprene dry suit - crushed or not- becomes a great big swamp cooler out of the water.
There is virtually nothing I'd rather ice dive in than a good neoprene dry suit as they are very warm, but once you get out you need to cover the suit with a non breathable cover such as a rain suit to keep the evaporative coooling in check between dives. Unless of course it is close to or below zero degrees F - in that case the water on the suit freezes nearly instantly and greatly limits evaporaticve cooling, you get a little sublimation but it is minimal.
On the other hand, the swamp coller effect can be used to advantage when gearing up on the boat in hot sunny 90 degree weather prior to a dive with 40 degree bottom temps. A quick dip in the water after you zip the suit keeps you much cooler until you can get in the water and the damp suit you don for dive two keeps you much cooler thorugh the whole suit donning and gearing up process.
A neoprene suit feels warmer and it also has much less condensation inside the suit compared to a trilam when your hot self and the humid air in the suit hops in chilly water.
There is virtually nothing I'd rather ice dive in than a good neoprene dry suit as they are very warm, but once you get out you need to cover the suit with a non breathable cover such as a rain suit to keep the evaporative coooling in check between dives. Unless of course it is close to or below zero degrees F - in that case the water on the suit freezes nearly instantly and greatly limits evaporaticve cooling, you get a little sublimation but it is minimal.
On the other hand, the swamp coller effect can be used to advantage when gearing up on the boat in hot sunny 90 degree weather prior to a dive with 40 degree bottom temps. A quick dip in the water after you zip the suit keeps you much cooler until you can get in the water and the damp suit you don for dive two keeps you much cooler thorugh the whole suit donning and gearing up process.
A neoprene suit feels warmer and it also has much less condensation inside the suit compared to a trilam when your hot self and the humid air in the suit hops in chilly water.