Description
The ideal stepping stone in your hydration and trail running game, ACTIVE SKIN 8 is easy to use, comfortably wearable and super modular. With soft, breathable fabrics and a snug secure fit, its strategic chest pockets ensure your flasks stay accessible at all times. Designed for reliability, using materials that are in it for the long haul.
Product Feature
Sensifit™
The construction uses stretch, breathable fabrics and lightweight adjustments to optimize fit and stability.
Quick link
This sternum strap enables you to adjust your pack quickly on the fly. The elastic makes it easier to breathe when you pick up the pace.
3D Airmesh shoulder straps
With a construction that incorporates small cavities, 3D Airmesh panel allows enhanced air circulation.
Bladder compartment
This item contains an internal bladder compartment with a hanging strap to hold the bladder in place.
Bladder tube exit
Sewn-in exit port for a hydration tube.
2 front stretch pockets
Expandable front pockets to store essentials you want to access on the go.
Large opening
Salomon bags have a large opening to make it easy to see and store your gear.
Key holder
This elastic key chain holder makes it easy to pull keys off the bag while remaining safely attached.
3D air mesh
Soft 3D mesh adapts to your body on the move, without rubbing your skin or tee-shirt. Larger holes maximize comfort and breathability.
Elastic power mesh
Highly stretch and breathable fabric that adapts to the body.
Fast wicking fabrics
Improving quick drying and moisture management, these light fabrics deliver top performance, comfort, and odor resistance.
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.