Men's Full 7mm & 8mm wetsuits are cold water wetsuits. These wetsuits are typically rated for 32° Fahrenheit temperatures and warmer. There are several styles of full cold water wetsuits to choose from. There are hooded full 7mm & 8mm wetsuits as well as two piece combo 7mm wetsuits, & suits that do not have a hood. It is important to study the amount of stretch in these cold water wetsuits because they are thicker and more challenging to move in. These suits are typically worn for sports like scuba diving, canyoning, and paddle sports. The seals are typically sealed because the least amount of water into the suit is key to your body heating up that water and keeping you warm. If the suit does not fit just right you risk getting too much water in the suit and your body working over time to keep that water in the suit warm.
Made for cold water, most of the wetsuits 7mm and 8mm wetsuits have the entire wetsuit made of one thickness, for example, 7mm wetsuits are 7mm thick throughout and there are not thinner arms. These cold water wetsuits can have specialized laminations that allow water inside the suits to wick away and drain quickly so that you stay warm.
If you are looking to be warmer in your wetsuit consider well fitted boots, hoods and gloves. Wetsuits with hoods get lower temperature ratings because of the additional hood. If you have a wetsuit without a hood, you can add a hood and your over all temp rating will also go down. Your head, feet, and hands can lose heat when in the water and the colder blood circulating throughout your body will make you cold. Protecting your your extremities will bring your temperature rating down. Additionally, adding thermal layers will provide additional warmth, there are hooded vests, thermal skinsuits, neoprene shirts, and neoprene pants.
These wetsuits can be helpful if you are looking for additional warmth. Two piece wetsuits are made up of a 7mm sleeveless john wetsuit and then a 7mm jacket that goes over it, by layering these two wetsuits you end up with 14mm thick neoprene in the chest and back. These suits are often worn for activities like scuba diving, gold digging, and commercial uses.