Why Do Zips Fail in HYROX Training and How Design Fixes It
Zips fail in HYROX training because grit, sweat and repeated abrasion from sleds, floors and constant washing jam or break exposed teeth and pull tabs, and a flapping zip is also a...
HYROX Intel
Perspectives on the sport. Written by our Athletes, and our Founders.
Hyrox Intel — Tagged "Fabric Science"
Why Are Race Singlets Made From Polyester and Elastane?
Race singlets are made from polyester and elastane because polyester wicks and releases sweat while staying light when soaked, and elastane adds the four-way stretch a singlet needs to move with you...
What Is 4-Way Stretch and Why It Matters for Lunges and Sleds
4-way stretch is fabric that stretches and recovers in all directions, horizontally and vertically, so it moves with the body through deep lunges, sled drives and full-range work without restricting or bagging...
What 2 Race Seasons of Testing Teaches About Fabric Failure
Two race seasons of testing teach one thing above all: fabric fails predictably. It goes at the seams before the panels, at friction points before flat areas, and it always shows its...
How Fabric Choice Affects Chafe Over 8 Kilometres of Running
Fabric choice affects chafe over 8 kilometres of HYROX running because chafe is caused by repeated friction, made worse by wet, heavy, clinging fabric and rough seams. A fabric that wicks sweat,...
The Real Reason Technical Kit Costs More Than Cotton
Technical kit costs more than cotton because it is engineered rather than just cut and sewn: performance synthetics, laser-cut or woven ventilation, heat-sealed and reinforced seams, tuned stretch blends and rounds of...
Why Seamless Construction Helps Under Load
Seamless construction helps under load because it removes the raised stitched joins that dig in, chafe and become failure points when a garment is stretched hard, pressed against by a barbell or...
How Fabric Recovery Determines Whether Kit Keeps Its Shape
Fabric recovery determines whether kit keeps its shape because recovery is the fabric's ability to return to its original dimensions after being stretched. Kit with strong recovery snaps back after every lunge,...
Why Do Barbell and Sled Contact Points Need Different Seams?
Barbell and sled contact points need different seams because they stress kit in different ways: a barbell across the back or shoulders presses and abrades a static point under heavy load, while...
What Is Modified Polyester and How It Removes Excess Weight
Modified polyester is standard polyester engineered to remove excess weight and add function, so the base fabric is stripped back as light as it can go while keeping the strength, wicking and...
How Fabric Blends Balance Softness, Stretch and Recovery
Fabric blends balance softness, stretch and recovery through a single number: the ratio of base fibre to elastane. Polyester or polyamide carries strength, structure and moisture handling; elastane adds the stretch and...
Why Ultra-Light Race Kit Reinforces Only Where It Fails First
Ultra-light race kit reinforces only where it fails first because adding strength everywhere would make the garment heavier and hotter, so the smart approach is to keep the whole piece light and...
What Makes a Fabric Quick-Dry After a Sweaty Session?
A fabric dries quickly when it spreads the water it holds over the largest possible surface area, so more of that moisture meets moving air at once. Evaporation happens at the surface,...
Why Do Some Seams Chafe and Others Don't?
Some seams chafe and others do not because of where the seam sits, how it is constructed and how much it moves against your skin. A thick, raised, stitched seam placed in...
Why Do Race Tops Reinforce the Hem?
Race tops reinforce the hem because the hem is where ultra-light race fabric fails first: it is gripped, tugged and rolled every time you pull it down after overhead work, and it...
What Is Precision Cutting Per Size and Why It Matters
Precision cutting per size means each size is cut to its own pattern rather than simply scaling one shape up or down, so the fit stays true across the whole size range....