Since the exact guarantee conditions couldn't be independently confirmed for this review, who covers return shipping is worth confirming directly.
Contact customer support to confirm whether return shipping is covered by the brand or paid by the customer, since this specific detail isn't published on the pages this review reviewed.
A guarantee that requires you to pay return shipping is worth less than one that doesn't — worth confirming this detail before you order, not after you've decided to request a refund.
Confirm current terms on the official checkout page before you order.
See The Current SodaPeak Offer