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.