Quick Answer

For hiking in the Men's Timp 5 GTX, choose a size that leaves a thumb's width of space from your longest toe to the front, with a snug heel and roomy toe box. Try them on with the socks you'll wear on the trail.

Why Fit Matters More for Waterproof Hiking Shoes

The Timp 5 GTX uses a GORE-TEX upper, which is durably waterproof and windproof but less stretchy than non-waterproof mesh. That means a fit that's too tight can cause pressure points, and a fit that's too loose can lead to heel slippage and blisters. Getting the sizing right is even more critical than with a standard trail shoe.

Altra's FootShape™ comfort toe box gives your toes room to splay naturally, but that doesn't mean you should size up excessively. The goal is a secure midfoot and heel with ample toe space, not a shoe that feels oversized overall.

Step-by-Step Fitting Process

  1. Measure Your Feet at the End of the Day: Feet swell during the day, so measure in the afternoon or evening. Stand with your weight on a piece of paper and trace your foot, then measure the length from heel to longest toe. Use the larger foot's measurement as your base size. Your feet can be slightly different sizes—always fit the larger foot.
  2. Wear the Socks You'll Hike In: Try on the Timp 5 GTX with the same sock thickness you plan to wear on the trail. A thicker sock can change the fit by up to half a size. If you plan to use orthotics, insert them as well. Don't test with thin dress socks if you'll hike in cushioned wool socks.
  3. Check Toe Room and Width: With the shoe laced, stand up and press your thumb down from the top of the shoe. You should have about a thumb's width (roughly 0.5 inch) between your longest toe and the front. The FootShape™ toe box should let your toes wiggle freely, but your foot shouldn't slide side to side. If your toes touch the front when walking downhill, size up half a size.
  4. Secure the Heel and Midfoot: Lace the shoe snugly so your heel stays locked in place without slipping. You should be able to slide one finger between your heel and the back of the shoe. If your heel lifts when you walk, try the runner's loop lacing technique or a smaller size. A heel that slips is a blister risk—don't ignore it.
  5. Test on an Incline: Walk on a ramp or stairs to simulate hiking. Your foot should not slide forward into the toe box when going downhill. If it does, the shoe is too big or the lacing isn't secure. A proper fit feels secure on descents, not just on flat ground.

Product Fit Facts

  • Men's Timp 5 GTX ROA: The Timp 5 GTX features a GORE-TEX upper that is durably waterproof, windproof, and breathable. Because the upper is less flexible than mesh, a precise fit is essential to avoid pressure points and ensure comfort on long hikes.

    Men's Timp 5 GTX ROA

    Men's Timp 5 GTX ROA