Salomon has the 2nd widest toe box out there as far as large-production boots go (the kind you'd find in most stores), behind the Atomic B series. They're nice and comfy though. As you go up in stiffness they tend to get a little snugger, which is about what you'd expect from any line of boots. So yeah, SPKs are quite wide, and won't fit you if you have a narrow foot.