Unfortunately, we do not have global coverage for online shopping (yet!). Since you are on the international website, please double check if your country is in the country list, and it is marked with a shopping bag icon. If it is, switch to it, and you will be able to purchase products here.
Alternatively, you can try finding a store nearby.
To give it a long life, wipe off moisture, sweat or dirt with a soft cloth when convenient. To wash the strap when stains on the surface are noticeable, apply neutral detergent (mixed with some water) . After washing, let it air dry.