Tighter or looser wetsuit? Which are the effects?
The concept works almost in general: considering the same model of wetsuit (so also the same basic parameters, such as thickness and type of neoprene), the more it is tight and adherent to the body and the warmer it is, but also less comfortable, especially in the movements and breathing. To the contrary, the more the wetsuit will be wide and the more it will be comfortable, not limiting movement and breathing, but the sacs of water that will create internally between wetsuit and body will determine a lower insulating capacity. All of this, of course, is valid within certain limits.