The included cut-to-fit rubber is also quite nice and
link not dissimilar to that which you might find included with higher-end Swiss dive watches. It's soft and comfortable, and it mounts into a chunky but curved fold-over clasp with a fold-out dive extension.
link For those not wild about rubber, the U50's 20mm drilled lugs can suit for a wider
link range of straps and, unsurprisingly, I found that the U50 worked beautifully on a NATO (or really any strap I threw at it).