Havaianas are very comfortable, long lasting, and attractive, but be careful on sizing.  First time I ordered 39-40 BR, 9-10 US and when they arrived they clearly said size 7-8 on each flip flop, too small for me so I had to return.  I then purchased the 41/42 BR, 11-12 US and when they arrived they clearly said size 9 on each flip flop.  Great shoes, well made, top quality, not sure why the sizing is listed incorrectly on Amazon??  The US sizes marked on shoe are not Men's size as stated in Amazon description, in fact the size 41/42 BR, marked size 9, are a true size 9, no way are they 11-12.