For warmer days, when you might not need a full suit, the Highline Plus series includes a shorty wetsuit as well as a neoprene top so that you can protect your core temperature without taking any hits to your flexibility. If you need something much warmer, at the opposite end of the scale you'll find a Highline Plus 5/4/3 wetsuit with integrated hood to greatly reduce heat loss. A Highline Plus 4/3 is a good compromise between the two, offering a level of protection as a good all-rounder for colder conditions in the summer and into the autumn. The numbers denote the thickness of the wetsuit neoprene in millimetres, with the higher numbers typically denoting the construction around the torso and the lower numbers for limbs where you need maximum flexibility.