Seiko 22mm 200m Rubber Strap with 2 FAT Spring Bars fits for the heads of SKX007J/K, SKX009J/K, SKX171J/K and SKX173J/K - USD25.00 + shipping

Why wave-vents 22mm strap rather than the straight-vents brother?  This wave-vents Seiko rubber strap is for professional 200m diving uses, not the one carries the mere function of wrapping the watch on your wrist.  Why risks your life?

See!

The strap is in fact not as blue as showing in the first pic.  This wave-vents version is thicker than the straight-vents rubber strap.