The bundled NATO strap is really quite good, I personally am not a fan of NATO straps, I think they add a bit too much bulk to a watch, granted they really suit some watches.
I'm currently wearing my speedmaster on a perlon strap it's a nice brown woven Palma model by Eulit, it offers great adjustment, is nice and breathable and allows the watch to fly under the radar - it's the one on my avatar actually.
Have a search for posts on different straps, the good thing about the speedmaster is it will work on almost any strap!
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