Hi, I think I'm pretty knowledgeable about brands that sell thongs. Generally, Amazon and Aliexpress don't have good quality, with rare exceptions. It's better to buy five thongs from good brands than ten terrible ones. If you're Spanish, check out Addicted Underwear, ES Collection, and Omohonia. Staying in Europe, the German brands Manstore, Olaf Benz, and Wojoer are excellent. The Greek brand Modus Vivendi is also interesting. There are other more niche brands in Europe. If you want, let me know. Or non-European brands, but you have to be careful about postage and customs fees.