Karhu Synchron Classic ‘Polar Night pack 2‘ reflecting pond deep lagoon. The Karhu Synchron was first launched in 1980. The sneaker owes its characteristic to its unique lacing system. The comfort of the sneaker is made possible by the 'air cushion unit'. An additional reinforcement is also made in the heel that provides more stability. The ‘Polar Nights pack‘ gets its inspiration from the periods of endless nights in Finland during winter time.