Carlos Sánchez

Carlos Sánchez
Carlos goes through 40+ pairs of running shoes per year while logging 100+ km per week. He trains on beaches, track and trails of Málaga, Spain. He has thousands of hours of research and experimentation under his belt which is why he is so geeky about foams, carbon plates and other materials. After clocking 3 sub-3 marathons in Boston, Paris and Chicago, he is on a quest to complete the Six Majors.

Guides

Why cutting running shoes in half is key to measuring midsole softness
Why cutting running shoes in half is key to measuring midsole softness

Disclaimer: For ease of understanding in the context of reviewing running shoes, we use the term "softness" instead of "hardness." In the RunRepeat lab, we ensure precise midsole softness measurements[…]

The role of heel counters in running shoes
The role of heel counters in running shoes

The heel counter in running shoes is a semi-rigid, U-shaped piece, that snugly wraps around the heel. It stretches over the shoe's upper heel portion and typically includes two sidewall parts that ext[…]

A runner's guide to choosing the right toebox
A runner's guide to choosing the right toebox

While the toebox might not be the most prominently featured aspect in the marketing of running shoes, it plays an essential role in determining the quality and comfort of your run. It's not just a mat[…]

The definitive guide to running shoe breathability
The definitive guide to running shoe breathability

Breathability in running shoes it's a crucial feature that's often overlooked by both consumers and critics alike. At RunRepeat, we're convinced of the essential role of airflow—a view that is s[…]

All you need to know about rockered running shoes
All you need to know about rockered running shoes

Only a short while ago, running shoes had a simple design: mostly flat with a modest upward tilt at the toe. But then brands like MBT and Hoka, among others, revolutionized the scene with their unique[…]

How brands' heel-to-toe drop measurements differ from reality in running shoes
How brands' heel-to-toe drop measurements differ from reality in running shoes

Ever laced up a fresh pair of running shoes, taken your first strides, and felt that the promised heel-to-toe drop simply doesn't match reality? If you've ever found yourself in this situation, you're[…]

Understanding the differences in men's and women's running shoes
Understanding the differences in men's and women's running shoes

Men's and women's shoes have different features. Though each aims to offer foot comfort and protection during runs, significant design and fit adaptations have been made over time to cater to the anat[…]

In-depth insights into running shoe outsoles (road & trail)
In-depth insights into running shoe outsoles (road & trail)

The outsole, a vital part of any running shoe, forms your crucial link with the ground during your run. Not only does it help prevent slips and falls, but it also ensures a firm grip, offering the tra[…]

The ultimate guide to running shoe foams
The ultimate guide to running shoe foams

Disclaimer: Due to the vast variety of running shoe foams currently available, some may be excluded (Chinese brands, entry-level or old EVA foams, etc). Please note that some foams may be released aft[…]

How much does the weight vary across different running shoe sizes?
How much does the weight vary across different running shoe sizes?

This guide would not have been possible without the help Running Warehouse Europe (and US). While we have hundreds of shoes in our lab at RunRepeat, obtaining the complete set of numbers for each shoe[…]

Running shoe upper: how to choose the best one for your needs
Running shoe upper: how to choose the best one for your needs

A running shoe upper is the part of the shoe that covers your foot and it’s sewed or glued to the midsole. It typically includes materials like knit, mesh, fabrics or plastic, and also has featu[…]

Effects of temperature on running shoes
Effects of temperature on running shoes

Cold temperatures, especially the ones below freezing, harden up the foam, and demand more “work” from the shoe on every stride. Thus, softness and durability are compromised. We have test[…]

Lab tests and in-depth reviews

Merrell Fly Strike
80
Good!
Salomon Genesis
94
Superb!
Altra Timp 5
86
Great!
Altra VIA Olympus 2
85
Good!
Nike Juniper Trail 2 GTX
75
Bad!
Saucony Peregrine 14
90
Superb!
ASICS Trabuco Max 3
80
Good!
Saucony Guide 17
89
Great!
Mizuno Wave Rebellion Pro 2
84
Good!
Puma Velocity Nitro 3
86
Great!
Adidas Supernova Rise
90
Superb!
Hoka Cielo X1
90
Superb!
On Cloudmonster 2
89
Great!
Hoka Arahi 7
78
Decent!
New Balance FuelCell SuperComp Elite v3
86
Great!
New Balance FuelCell SuperComp Elite v4
91
Superb!
Saucony Endorphin Pro 4
91
Superb!
Saucony Endorphin Speed 4
87
Great!
La Sportiva Mutant
87
Great!
Nike Zoom Victory Waffle 5
70
Superb!
Saucony Ride 17
90
Superb!
ASICS Gel Nimbus 26
88
Great!
Adidas Sprintstar
87
Superb!
Adidas Prime SP2
86
Great!
Nike Air Zoom Maxfly
76
Good!
New Balance DynaSoft Nitrel v5
78
Decent!
Nike Flex Experience Run 12
73
Bad!
Brooks Divide 3
89
Great!
Merrell Agility Peak 4
84
Good!
Nike Revolution 7
78
Decent!
Nike Vomero 17
89
Great!
Nike Alphafly 3
77
Bad!
Saucony Xodus Ultra 2
87
Great!
ASICS Trabuco Max 2
91
Superb!
Altra Superior 6
74
Bad!
Mizuno Wave Sky 7
87
Great!
Adidas Supernova 3
81
Good!
Altra Provision 7
83
Good!
New Balance Fresh Foam X 1080 v13
86
Great!
PUMA Magnify Nitro 2
86
Great!
Saucony Axon 3
86
Great!
Saucony Sinister
87
Great!
ASICS GT 2000 12
90
Superb!
Brooks Ghost Max
90
Superb!
Reebok Zig Dynamica 4
80
Good!
Allbirds Tree Dasher 2
89
Great!
On Cloudultra 2
93
Superb!
Brooks Caldera 6
87
Great!
Salomon Pulsar Trail
85
Good!
Merrell Agility Peak 5
89
Great!
Hoka Challenger 7 GTX
78
Decent!
Nike Pegasus Trail 4 GTX
84
Good!
Hoka Clifton 9 GTX
87
Great!
Asics Magic Speed 3
90
Superb!
Brooks Hyperion Tempo
90
Superb!
On Cloudeclipse
91
Superb!
ASICS Novablast 4
91
Superb!
Merrell Vapor Glove 6
87
Great!
Merrell Trail Glove 7
80
Good!
Salomon Thundercross
92
Superb!
Brooks Catamount 2
88
Great!
Hoka Torrent 3
80
Good!
Hoka Speedgoat 5 GTX
82
Good!
Altra Outroad 2
80
Good!
Salomon Speedcross 6 GTX
83
Good!
Merrell Nova 3
85
Good!
Salomon Supercross 4
85
Good!
Hoka Mafate Speed 4
88
Great!
Hoka Tecton X 2
88
Great!
Salomon Speedcross 6
88
Great!
Nike Juniper Trail 2
79
Decent!
Nike Ultrafly
90
Superb!
Nike Vaporfly 3
88
Great!
New Balance FuelCell SuperComp Trainer v2
88
Great!
Mizuno Wave Inspire 19
89
Great!
On Cloudflow 4
92
Superb!
Mizuno Wave Rebellion Pro
88
Great!
Adidas Pureboost 23
81
Good!
New Balance FuelCell Propel v4
86
Great!
On Cloudboom Echo 3
84
Good!
Asics Noosa Tri 15
88
Great!
Mizuno Wave Rider 27
92
Superb!
Hoka Kawana
85
Good!
Nike Pegasus 40
87
Great!
Brooks Trace 2
88
Great!
Hoka Clifton 9
86
Great!
Brooks Hyperion Max
89
Great!
Altra Paradigm 7
83
Good!
Adidas Adizero SL
88
Great!
Hoka Transport X
87
Great!
Nike Winflo 10
82
Good!
Hoka Rocket X 2
86
Great!
Saucony Endorphin Elite
91
Superb!
Saucony Triumph 21
87
Great!
Nike InfinityRN 4
85
Good!
ASICS Superblast
92
Superb!
Hoka Zinal 2
79
Decent!
ASICS GT 1000 12
81
Good!
Hoka Gaviota 5
83
Good!
ASICS Gel Kayano 30
88
Great!
Hoka Mach X
88
Great!
Brooks Beast GTS 23
87
Great!
Brooks Cascadia 17
86
Great!
ASICS Gel Venture 8
85
Good!
Brooks Launch GTS 10
85
Good!
Brooks Launch 10
85
Good!
Brooks Adrenaline GTS 23
87
Great!
Under Armour HOVR Phantom 3
77
Bad!
Brooks Glycerin GTS 20
90
Superb!
Adidas Galaxy 6
81
Good!
On Cloudflyer
88
Great!
On Cloud X
89
Great!
On Cloudstratus
88
Great!
On Cloud Waterproof
87
Great!
Adidas Adizero Adios Pro 3
91
Superb!
On Cloudflyer 4
84
Good!
Mizuno Wave Rebellion
82
Good!
Adidas Racer TR21
88
Great!
Reebok Floatride Energy 5
85
Good!
Under Armour Charged Assert 10
83
Good!
Under Armour Charged Assert 9
84
Good!
Adidas Runfalcon 3
82
Good!
Adidas Adizero Boston 12
91
Superb!
Adidas Adizero Boston 11
83
Good!
Adidas Ultraboost 1.0
89
Great!
Nike Terra Kiger 9
89
Great!
Brooks Ghost 15
88
Great!
PUMA Deviate Nitro Elite 2
90
Superb!
ASICS Gel Venture 9
89
Great!
New Balance Fresh Foam X More Trail v3
87
Great!
ASICS Gel Cumulus 25
88
Great!
On Cloudswift 3
86
Great!
Salomon Ultra Glide 2
87
Great!
Salomon Sense Ride 5
85
Good!
Nike Wildhorse 8
84
Good!
Saucony Kinvara 14
78
Decent!
Hoka Challenger 7
85
Good!
Hoka Solimar
86
Great!
Hoka Gaviota 4
85
Good!
Nike Pegasus Turbo
80
Good!
New Balance Fresh Foam X More v4
88
Great!
Nike Air Winflo 9
83
Good!
New Balance FuelCell Rebel v3
88
Great!
Nike Alphafly 2
84
Good!
New Balance Fresh Foam X Hierro v7
86
Great!
Adidas Adizero Adios 7
80
Good!
Saucony Axon 2
88
Great!
ASICS Trail Scout 2
83
Good!
Nike ZoomX Streakfly
86
Great!
Adidas Adistar
88
Great!
Hoka Anacapa Low GTX
83
Good!
Merrell Moab Speed GTX
79
Good!