Long john wetsuit is a spring wetsuit for those that really hate to have neoprene covering their arms and restrict their paddling. Long john has no sleeves for your arms and has long legs. No arm sleeves means no resistance while paddling. Long john wetsuit is meant for spring and autumn surfing and surfing in water with temperatures around 64F–68F (18C–20C).
Long john has thicker neoprene than summer wetsuits, usually long john is a 3/2 wetsuit. Seams can already be blindstitched and glued which means they are almost waterproof.