We are searching for a manufacturer that can produce flip flops with the material similiar to Havanianas. We understanding that they are patented. Are there any other materials as soft, comfortable and flexible as those? How can I be sure when contacting them besides asking for reference samples that they have already produced? Are there any particuliar import regulations working with the South American countries? Our volume is not high, pretty sure that might restrict us from working with alot of the large companies over there. Any useful suggestions will be greatly appreciated. Thank-you!