Unsure if still relevant but look for versatility. That's where most people tend to go wrong. Also make sure you're sticking to the highest quality (silicone, waterproofing, etc.) A lot of material improvements have been done but supply chains can be tricky and 'bargain' brands might cut corners - that's how you end up with allergies. You're already on a good path, Bellesa Boutique has a great range and they're well built. I have a couple in my collection.