I think that every guy should own a comfortable and stylish pair of sandals/mandals. Straddling the divide between style staple and style sin, the sandal, in its many forms, is one of the most polarising pieces in menswear. I prefer wearing (sandals) my stylish gladiator sandals when walking around our village or just to have a moment at the park near our house than wearing flipflops, tho flip flops are very comfortable to wear but I think its not that really stylish, whatever design or print of your flip flops, still its a flip flop. Sandals are more refined and stylish alternative to flip flops, invest in a timeless leather pair and you're sure to get good use from them for many more summers to come.
White leather jacket from Guilliano Fujiwara
White shirt from COS
Jogger pants from Folded and Hung
Sandals from Zara