No buyer's protections at all. If seller sends you a bogus item instead of your purchase, which is what happened to me, your only recourse is to send it back with a tracked service at your own *additional* cost, for a partial reimbursement. Vinted's fine print makes this explicit, with no protections for you, as was just pointed out by their customer service team. Wish I had checked out feedback on social media sites before joining, although fortunately, only lost a small amount of money in the end. But definitely avoid. Surprising that it's that bad compared to other selling platforms and normal retailers.
**UPDATE**: contacted Barclays and they refunded the purchase IN FULL, including shipping, since Vinted's "Terms and Conditions" can't go above UK law (google Consumer Rights Act 2015). It was easy and quick so just a tip if you're here because Vinted ripped you off too!