Last width describes one part of a boot’s shape. A narrow forefoot measurement does not tell you the instep height, heel pocket or cuff volume—and matching one number does not establish a fit.
Measure the whole fit problem
| Area | What to notice |
|---|---|
| Forefoot | Width and pressure around the ball of the foot. |
| Instep | Space and pressure over the top of the foot. |
| Heel and ankle | Whether the heel stays seated as you flex. |
| Cuff | How the boot wraps the lower leg without excessive closure tension. |
Compare size as well as advertised last
Atomic’s Hawx Ultra product information uses a 98 mm low-volume label, while its size chart lists different widths for different shell sizes. Compare the reference size and your actual size, not just two headline last numbers. “Low volume” is useful family-level language, not a complete three-dimensional measurement of your foot.
- Have both feet measured for length and width, and describe instep pressure or heel movement.
- Try the appropriate shell size first; sizing up to escape width pressure can create unwanted length and heel space.
- Compare heel retention and instep comfort with ordinary closure tension. Ask which fit changes the model permits.
Decide with a fitter
Bring your skiing socks and existing footbeds. Tell the fitter where previous boots failed. A width match that crushes the instep or leaves the heel loose is not a successful fit. Combine the fit assessment with flex and the intended use before choosing a shell.
Sources and scope
Atomic boot-fit learning hub and Hawx Ultra size and fit information.
Reviewed October 4, 2026. The 98 mm example describes that product family, not all low-volume boots.