Men's Infrared Performance 3/4 Leggings
Men's Infrared Performance 3/4 Leggings
Express Next Day Available
Men's Infrared Core 3.0 3/4 Length Leggings:
Men's Infrared Performance & Training 3/4 Length Leggings. Clinical studies show users can gain up to an 8. 7% athletic performance enhancement from first wear
Why IR50? Our Most Advanced Recovery Technology
- Boosts circulation to deliver oxygen and nutrients where your muscles need them most.
- Accelerates lactic‑acid removal, reducing soreness, stiffness and fatigue after intense training.
- Supports cellular metabolism + repair, helping you recover faster between sessions.
- Reduces inflammation and discomfort associated with high‑load training and repetitive stress.
- Temperature‑regulating infrared fabric keeps you warm or cool as needed, ideal for all‑day wear.
The technology behind the textile
KYMIRA’s patented KYnergy® infrared textile embeds a matrix of bioceramic minerals into each fibre. These minerals capture body heat and convert it into far-infrared (FIR) light in the 6–14 µm range, supporting circulation, oxygenation, energy production and recovery.
From body heat to biological signalling, the technology is designed to support the body throughout movement and recovery.
Body heat is absorbed by the mineral matrix and re-emitted as FIR light in the 6–14 µm range.
FIR exposure is linked to increased nitric oxide availability, promoting local vasodilation and improved micro-circulation.
Independent tcPO₂ studies show that FIR garments raise tissue oxygenation, supporting aerobic energy pathways at a lower physiological cost.
FIR supports cellular energy and ATP production, helping sustain output and reduce the sensation of fatigue.
Exercise studies show FIR garments activate signalling pathways related to mitochondrial biogenesis and angiogenesis.
FIR helps stabilise micro-temperature during and after exercise, while the textile maintains breathability and moisture management.
Designed to support sustained output, movement quality and rapid in-session recovery.
Consistent movement starts with muscles that are prepared, oxygenated and able to maintain efficient mechanics under fatigue.
Enhanced circulation and oxygenation help prime muscles to be stronger and more flexible, supporting mobility and consistent movement patterns. Efficient muscular contraction, cellular energy support and reduced fatigue may help limit compensatory mechanics. Temperature regulation helps maintain muscle compliance, while recovery mechanisms support lower cumulative tissue stress between sessions.
Performance technologies should complement, not replace, a progressive training plan, appropriate warm-up, recovery, and professional medical advice where needed.
The size charts below detail the relevant sizing or points of measurement for all of our products. Our garments do not need to be tight and against the skin for our infrared technology to work, so we suggest fitting to your personal preference. If you are looking for a looser fit, then size up from the guide's suggestions.
| Size | XS | S | M | L | XL | 2XL |
|---|---|---|---|---|---|---|
| K-Mask: Head circumference (UK only) | — | 45cm – 55cm | 50cm – 60cm | 55cm – 65cm | — | — |
| Socks & sleeves foot size (UK) | — | 3 – 5 | 6 – 8 | 9 – 11 | 14 – 16 | — |
| Socks & sleeves foot size (USA) | — | 5 – 6 | 7 – 10 | 11 – 14 | 15 – 17 | — |
| Socks & sleeves foot size (EU) | — | 35 – 38 | 39 – 42 | 43 – 47 | 49 – 52 | — |
| Socks & sleeves calf size (all) | 27cm – 32cm | 34cm – 39cm | 37cm – 42cm | 40cm – 45cm | 43cm – 48cm | 45cm – 50cm |
| Arm sleeves bicep size (all) | 26cm – 31cm | 29cm – 34cm | 32cm – 37cm | 35cm – 40cm | 38cm – 43cm | 42cm – 46cm |
| Size | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Gloves | 17cm | 17.5cm | 18cm | 18.5cm | 19cm |
| Gloves (when worn as a liner) | 17.5cm | 18cm | 18.5cm | 19cm | 20cm |
| Size | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Tops (chest, UK) | 8 | 10 | 12 | 14 | 16 |
| Leggings & shorts (waist, UK) | 8 | 10 | 12 | 14 | 16 |
| Tops (chest, USA) | 4 | 6 | 8 | 10 | 12 |
| Leggings & shorts (waist, USA) | 4 | 6 | 8 | 10 | 12 |
| Tops (chest, EU) | 36 | 38 | 40 | 42 | 44 |
| Leggings & shorts (waist, EU) | 36 | 38 | 40 | 42 | 44 |
| Size | XS | S | M | L | XL | 2XL |
|---|---|---|---|---|---|---|
| Tops (chest) | 34" – 36" | 36" – 38" | 38" – 40" | 40" – 42" | 42" – 44" | 46" – 48" |
| Leggings & shorts (waist) | 28" | 30" | 32" | 34" | 36" | 38" |
| Leggings & shorts (inner leg) | 27" – 28" | 28" – 30" | 30" – 32" | 34" | 34" | 34" |
Absolutely. As soon as your vest leaves the warehouse, you will receive a shipping confirmation email containing a direct tracking link. You can follow your package's journey every step of the way right to your front door.
We offer simple shipping options for all mainland UK orders:
• Running Vests:
• Enertor Insoles:
• Socks (Partner Fulfilled):
Order Processing & Cut-Off Times
• Cut-Off Time: Orders placed before 2:00 PM GMT are processed the same day. Orders placed after, or on UK Bank Holidays, will be processed the following day.
• 7-Day Delivery: Once dispatched, deliveries take place seven days a week, including Saturdays and Sundays. Please note that couriers do not deliver on official UK Bank Holidays, and these orders will arrive the next available day.
How Your Order is Fulfilled
To get your gear to you as fast and reliably as possible, we store our dedicated UK inventory within a premium professional fulfillment network managed by Amazon. Your running vests and insoles will arrive in high-quality, plain packaging to protect your unboxing experience. However, please don't be surprised if your tracking details or delivery courier are from Amazon Logistics—we use their world-class logistics to ensure your order hits your doorstep efficiently. Sock orders are fulfilled and dispatched directly by a partner brand.
Our goal is for every customer to be totally satisfied with their purchase. If this isn't the case, let us know and we'll do our best to work with you to make it right. You have 30 days from purchase to return a product due to an incorrect size ordered or to report a defect.
Head to our contact page here, fill in the form and we'll get back to you within 24 hours.
We don't just talk about honest materials; we back them up. The Run With Freedom® Vest is built to withstand countless miles, season after season. That's why every vest is covered by our unconditional 2-Year Guarantee* against defects in materials and workmanship. This isn't just a warranty—it's a promise that your investment in speed and freedom is protected. Focus on your run, we'll focus on the gear.
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Buckles & Hardware
Stitching & Seams
Fabric Integrity
Twin adjustable chest straps allow you to customise the tension on the fly, minimising vest movement and preventing chafing even when fully loaded.
