I dive solely in southeast Alaska where water temps are 50F in the summer and 35F in the heart of winter. I use the 7mm suit and I can stay warm indefinitely in the summer, and about 1-2 hours in the winter. Love the suit for the price and I keep coming back to Bluetuna for the quality of their products and their customer service.
Super stretchy and soft neoprene. Super strong and slick wetsuit. The 5mm feels super warm and is great quality.