Hi and welcome!
When the TAG Heuer Connected Modular 45 was launched, the straps were too long for most of the wrists, and this problem was later solved by TH with shorter straps (but keeping the same reference number). When the watch was bought new to the AD, TAG Heuer offered free replacement for these too long straps, but I don’t know if you have bought it new or second hand.
So, if you buy additional straps online, be sure that you are going to receive the updated size and not the first version: the shortest half of the strap measures 9.5cm in the old version, and 7.5cm in the updated version. Ask this size to the seller before buying it, to be sure.
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