Let me start by saying that I find these tennis shoes so comfortable that I only own 4 pairs (Utility Black/Solar Pink, Blue/Black/Coral, Trace Olive /Black /light green, black/grey/sunny pink). I have wide feet and most tennis shoes seem to squeeze my feet. However, the NMD R1 STLTs offer the most comfortable fit of any shoe I've tried. Knitted mesh wraps your feet for a sock-like feel, while a Boost midsole provides responsive cushioning like you're walking on clouds. I usually wear a size 11, but I bought a size 11.5 to accommodate the Dr. Scholl Plantar Fascitic Insoles which I use in all my shoes. I also recommend wearing low-cut socks to cushion your ankles as these tennis shoes do not offer ankle padding.