Seek Amp stands for epic stretch. Ultra-flexible thermo lining combined with lightweight neoprene provides 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.