Compatible with all foot types. Best for Mid to High arch. Thickness: 3mm. Military grade UHD Memory Foam, makes each step feel like walking on a cloud while wicking away moisture. Absorbs more than 90% of shock energy in lab testing compared to only 53% in other “performance” insoles (ASTM F 1614-1999). Footprint's proprietary material is the exact same formulation as used by NASA on the ISS for sensitive electronics protection. Get any size the same or larger than yours, trim to fit.