Men's Targhee IV Wide Hiking Boot: Waterproof Fit Guide

By weOfficial KEEN® Site – Consciously Created Footar for a Better Planet | KEEN Footwear | Published: 2026-10-25

Category: How-to Guides

Learn how to get the right fit in the Men's Targhee IV Wide Waterproof Hiking Boot, including sizing tips and common mistakes to avoid.

Quick answer

For the Men's Targhee IV Wide Waterproof Hiking Boot, start with your usual boot size but expect a roomier toe box. Focus on heel lock and width over length, and always test with the socks you'll hike in.

Why fit matters more for wide waterproof boots

Waterproof boots have less give than non-waterproof versions because the membrane and sealed construction limit stretch. A boot that is too tight will cause pressure points and blisters; one that is too loose leads to heel slip and lost energy. The Targhee IV Wide is built on a wider last, so you get the volume without sizing up excessively.

The glue-free, fused construction of this boot also means the upper won't soften or loosen much over time. That makes initial fit critical—what feels snug in the store is what you'll get on the trail.

How the Targhee IV Wide differs from standard width

The Targhee IV Wide is not just a standard boot with extra material. It uses a dedicated wider last that increases volume across the forefoot and toe box while keeping the heel pocket snug. This is ideal for hikers with wide feet or those who need room for thick socks. If you have narrow feet, the standard width version will likely fit better.

How to fit the Men's Targhee IV Wide Waterproof Hiking Boot

1. Measure your foot length and width at the end of the day: Feet swell during the day, so measure in the afternoon or after a walk. Use a Brannock device or trace your foot on paper. Compare your width measurement to KEEN's size chart—if you're between widths, the Wide option is likely correct. A common mistake is measuring in the morning when feet are smallest, leading to a boot that feels tight after a few miles.
2. Try on with your hiking socks: Wear the exact socks you plan to use on the trail—medium-weight wool or synthetic hiking socks. The Targhee IV Wide is designed to accommodate thicker socks, but testing with them ensures the toe box and instep aren't too snug. Using thin dress socks will give a false sense of room; you may end up with a boot that feels loose when you switch to hiking socks.
3. Check for thumb-width space at the toes: With your heel pressed to the back of the boot, you should have about a thumb's width (half an inch) between your longest toe and the front. Because the Targhee IV Wide has a roomier toe box, this space is easier to achieve without going up a full size. Don't rely on toe touching the front when standing—test by squatting or walking downhill to simulate forward pressure.
4. Lock your heel with the lacing system: Use the top two eyelets to create a heel lock: lace the boot normally, then take each lace across to the opposite top eyelet before tying. This pulls the heel back into the pocket and reduces slip. The Targhee IV's padded collar helps hold the heel without overtightening. If your heel still lifts more than a quarter-inch after lacing, the boot may be too wide or too long—try a half-size down or the standard width.
5. Walk on an incline to test fit under load: Walk up and down a ramp or stairs. On the descent, your foot should not slide forward into the toe box. If it does, the fit is too loose. The Targhee IV's compression-resistant cushioning maintains support, so any slide indicates a sizing issue rather than soft foam. A boot that feels fine on flat ground may reveal fit problems on a slope—always test on an incline before committing.

Product facts

Men's Targhee IV Wide Waterproof Hiking Boot | Triple Black: The Targhee IV Wide uses a glue-free, fused construction that won't delaminate and cushioning that resists compression. This means the fit won't change much over time, so you need to get the size right from day one—no expecting the boot to stretch or break in significantly.
Men's Targhee IV Wide Waterproof Hiking Boot | Triple Black