Why Do Race Shorts Use a Different Fit to Run Shorts?
Race shorts use a different fit to run shorts because HYROX is not just running: the fit has to survive sled pushes, deep sandbag lunges, wall balls and burpees as well as...
HYROX Intel
Perspectives on the sport. Written by our Athletes, and our Founders.
Hyrox Intel — Tagged "Fabric Science"
Why Do Interior Liners Use a Different Fabric to the Outer?
Interior liners use a different fabric to the outer because each layer has a different job: the outer prioritises softness, structure and abrasion resistance, while the liner sits against your skin and...
Why Nylon-Elastane Is Used for Squat-Proof Women's Shorts
Nylon-elastane is used for squat-proof women's shorts because nylon fibres are strong and tightly knittable, giving an opaque fabric that does not go sheer when stretched over the glutes, while elastane provides...
Why Denser Fabric Isn't Always More Durable
Denser fabric is not always more durable because durability comes from fibre quality, weave structure, stretch recovery and seam construction, not from sheer weight. A heavy, dense fabric can still abrade, lose...
Why Woven-In Breathable Holes Outlast Printed Mesh Panels
Woven-in breathable holes outlast printed mesh panels because the openings are built into the knit structure itself, so they cannot peel, crack, clog or wash off the way a printed or bonded...
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...
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...