Ccilu Men's HERO Sandal Ccilucell/Mesh CCILUCELL micro-honeycomb structure makes CCILU footwear only about 180 grams per pair, The nano-molecular structure of CCILUCELL provides a technical effect of smoothness and give a consistent comfortable fit High frequency molecular vibrations in CCILUCELL absorb shock from body movement Strong molecular link provides abrasion resistance exceeding that of natural rubber selected formula CCILUCELLs effective antimildew, antibacterial, and antimicrobial formula keeps CCILU customers comfortable and healthy Labelust and Ccilu recommend buying a full size down from your typical size. i.e. If you wear a 10, we suggest a size 9 for the best fit.