Seiko 5 Sports Automatic Polyester SNZG15J1-var-NATO24 100M Men's Watch The Seiko 5 Sports Automatic allows you to be disruptive in your line of sports and find your current limits in matters of intensity. The mainspring and shock-resistance system give Seiko 5 its distinctive accuracy and strength. Together with the NATO-inspired polyester straps in a style explicitly developed for diving by Seiko themselves, it’s the same, strong weave pattern invented centuries before as in the traditional obijime cord (the sash) for a Kimono.