Seiko 5 Sports Automatic Polyester SNZG11K1-var-NATO24 100M Men's Watch This Seiko strap is specially woven in the traditional way to offer several more times the tensile strength of a standard NATO strap, which secures the watch better to your wrist amidst vigorous activities not limited to sports. The entire watch is constructed to handle extreme stress within harsh outdoor conditions and can go for years without servicing or maintenance.