APL Big Logo TechLoom Slide sz 9 /40. I have two other pair in the same size and I am usually a 7.5/38 and these fit just slightly oversized. Details - Seamless TechLoom strap with raised embossed APL logo provides a custom, comfortable fit. - Antimicrobial mesh covers the 3D molded footbed which massages your feet with every step. - Mesh-backed strap keeps your foot cool and dry whether you wear socks or like to go barefoot. - Soft and resilient Propelium™ midsole provides superior comfort that will maintain structural integrity longer than conventional EVA. -The lightest APL shoe ever weighing in at 4.0 oz in a Women’s size 8. -100% Vegan made using no animal products. Athletic Propulsion Labs