What’s the return policy on Apple Watch wrist band?

think it's the same as the apple watch itself and any other products

some countries has a 14 return policy if the user don't want the product anyway

most countries seems to have a min 1 year warranty in terms of production issues discovered after purchase

https://www.apple.com/legal/warranty/

as the product has been purchased directly from Apple(either at a retail store or online), customers have 14 days to return it from the date they received it. But to get a refund, the device must be repackaged with all the cords, adapters and documentation that were included when it was bought.