I replaced the plain strap that came with my watch and this is SO much better for sports

This Apple Watch sports strap is a game-changer for my workouts.

Great for swimming

incredibly comfortable, even for extended wear. I can wear it from my morning run to a full day of work without any discomfort.

Very nice and comfortable. Colors are quite lovely - the Teal under-color seems to almost glow! I really like the elongated holes nearer the watch, which visually sets them apart from the normal ones, and the closure/retention system is also interesting, slightly different from Apple's. My only concern would be that they seem to be a bit small. My wrist is only 7", which doesn't seem large for the 45mm watch, and while it fit me, I suspect if you're beyond 7.5" (19cm-ish) you'd have something a bit too tight.