The Amaze Amp 5/4 Front Zip stands for an epic stretch without compromising warmth, making it the perfect wetsuit all year round. Stretchy material topped with a minimalistic panel design provides freedom of movement in the crucial arm and shoulder area. The secret for optimal heat retention lies in ION's super flexible Hot_Stuff 2.0 thermo lining combined with toasty warm Plasma_Plush 2.0. On top, I_foam neoprene traps more air due to its foamy structure, improving heat retention and flexibility. Another feature that shelters you from icy showers is a small silicone print at the front zip opening area. It increases the connection between the top and bottom opening of the flap.