Amaze Amp stands for epic stretch. Ultra-flexible thermal lining combined with lightweight neoprene provide extra warmth for uncompromising freedom of movement all year round. The secret for optimal heat retention lies in ION's super-flexible inside lining, called Hot_Stuff 2.0, in combination with toasty warm Plasma_Plush 2.0 on the back panel. I_foam neoprene foam traps more insulating air thanks to a new structure which contributes to better heat retention and flexibility. In spots without thermal lining, super soft Silk_Stuff increases next-to-skin comfort to the max.