Description
People love the idea of adventure in the great outdoors, but there’s more to the natural landscape than fresh air and scenic views. Uneven terrain, debris, and moisture are unique challenges to footwear that require specialized construction. For those who take going off the beaten path literally, there’s the Fresh Foam X Hierro, a dedicated, off-road application of our best running technology. The Fresh Foam X Hierro v7 employs a Vibram® Megagrip outsole to create a protective shell of durability and traction around the signature Fresh Foam X cushioning and a breathable, lightweight upper.
Product Feature
- 8 mm drop; due to variances created during the development and manufacturing processes, all references to 8 mm drop are approximate
- Fresh Foam X midsole delivers our most cushioned Fresh Foam experience for incredible comfort
- Synthetic and mesh upper
- Upper features a breathable yet protected construction
- Vibram® Megagrip outsole provides superior grip. Vibram® is a registered trademark of VIBRAM S.p.A All rights reserved.
FITTING AND ADJUSTING TIPS
SIZING
How to measure your foot length
- Stand with the heel to a wall and put a measuring tape under your feet
- Read off the measured foot length in millimeters before your longest toe
- If you are between two sizes, choose the next higher, because feet are minimally greater under load
You can also use our template:
Download the foot measurement template
Birkenstock products are offered in European sizes. Please reference our Size and Width conversion charts below to determine your SA/UK size.
Your feet should be able to move freely without your toes hitting the edge of the footbed.

Before trying them on, put one hand under the toe and one under the heel, then flex the footbed a few times. This will initiate the break in period and will your help your new sandals feel comfy sooner.
Open all straps and step into the footbed. Close the straps comfortably, leaving enough space to allow your feet the freedom of movement. Exhale and enjoy.
For the first five or six times you wear your new footwear, limit the time to just a few hours. This allows your feet and body to gradually get used to the contoured arch support as well as the straps and buckles.