On your Alpinstore account you can request a return for exchange.
Then you just have to choose the item(s) to be exchanged.
Remember to indicate us:
The name of the product (or the reference)
The size or size you want
The desired colour
Exchanges are accepted for identical products of different size and/or color(s) if the price is the same.
If the price is different you can either have the difference refunded or a payment link to confirm the exchange.