Do not automatically buy hiking boots one size larger. Size labels vary, and extra length does not correct every width or volume problem.
Fit the actual foot and sock
Try both boots with the socks you intend to use. Check toe room on a safe descent and heel movement uphill. Consider width and shape as well as length. A loose heel can coexist with pressure elsewhere.
Avoid a single shortcut
A thumb-width test can be a rough prompt, but it is not a complete fitting method. Follow the manufacturer's guidance and ask a knowledgeable fitter when possible.
Test before travel
Walk enough to assess comfort while you still have options under the return policy. Read the full boot-fit guide. For an Atlas trek, the right size is the pair that works in use, not a predictable increment above your everyday shoe number.
Atlas Hikes
Editorial team