The Fitbit Versa 4 comes with two wristband sizes: Small (S) and Large (L). The small size fits wrists with a circumference of approximately 5.1 to 7 inches (approx. 130-178 mm), while the large size is suitable for wrists with a circumference of approximately 6.5 to 8.6 inches (approx. 165-218 mm). The exact measurements may vary slightly depending on the model, but in general the Versa 4 is supplied with both sizes to cover different wrist circumferences.

So if you want to know whether the bracelet comes in size L or S, the answer is that it is available in both sizes.