Whether you choose to wear this 5mm Men's NeoSport SCUBA Step-In Wetsuit Jacket alone or layer it with the matching long john which is sold separately, you get a warm and durable wetsuit for your next cool to cold water SCUBA dive. With features such as a heavy duty front zipper along with durable flatlock seams, you've got a suit that's easy to get in and out of as well as one that will last you even in the harshest of environments.