This is a great wet suit. I got it on sale. I've been rafting on the Tuolumne and Merced in spring, very chilly snow water, but I actually stayed warm in this suit, except my legs, but I actually didn't notice much since my legs were rarely submerged in water. I was comfortable for the entire 6-hour ride,(including a one hour break). It fits very tight, not sure if this is by design or not, but after it's on, it seems to mold to your body very well and the snug fit is not noticeable. The draw string in back makes it easy to zip up and unzip. For the price I paid, the Sonic is a great deal.