Energy conversion
Body heat is absorbed by the mineral matrix and re-emitted as FIR light in the 6–14 µm range.
Men's Infrared Half Zip Fleece
S / Black
£54.00 GBP
Sale price
£54.00 GBP
Regular price
£120.00 GBP
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Men's Infrared Half Zip Fleece
£54.00 GBP
Sale price
£54.00 GBP
Regular price
£120.00 GBP
MFHZ02-01
Express Next Day Available
Key Features
Men's Infrared Infracycle™ Half Zip Fleece:
- Brushed inner fleece face
- Active fit
- Zip lock neck, for temperature regulation
- 2 large, zip secured pockets
Description
The Infracycle Half Zip Fleece provides you the perfect combination of warmth, style and the numerous benefits of our KYnergy technology. This fleece is just as great for casual use as it is out on the slopes, in a tough weights session, or on a cold morning run.
Featuring a tapered fit, luxurious water-repellent fleece and a high-rise collar to insulate against cold, rain or wind, this is a perfect choice for outdoor enthusiasts and gym goes alike. With zipped pockets, you can train safe in the knowledge that your keys and cash are secure. The wide zip lock neck makes the top easy to take off whilst wearing a snow sports or cycling helmet, but is also perfect for helping regulate temperature.
The fleece is made from our infrared-emitting fabric, a technology that helps keep you warm and regulate your body temperature, but which also promotes circulation of the blood, enhancing energy availability, tissue oxygenation and promoting recovery.
Size & Fit
Model is wearing: Size Large
Model's height: 183cm / 6'0''
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.
Men’s Sizes
Top (Chest)
| XS | 34"" - 38"" |
| S | 36” - 38″ |
| M | 38″ - 40” |
| L | 40″ - 42” |
| XL | 42“ - 44” |
| XXL | 46″ - 48” |
Infrared Benefits
- Increased local blood circulation
- Increased tissue oxygenation - by up to 20%
- Increased cellular metabolism
- Enhanced energy production
- Temporary pain relief - experience a 25% average reduction in pain naturally
- Accelerated recovery rate - from physical exertion, injury and surgery
- Reduces Inflammation
- Injury prevention - 80% average reductions in soft tissue injuries via muscle priming
- Temperature regulation - warms & cools to suit your needs - clothing stores thermal energy 63% longer than standard fabrics when used as a base layer - fabrics dry 65% quicker than average fabrics
- SFP35+ rating
- Antimicrobial
Best Use
Our garments have been engineered by our team of KYMIRA Sport scientists to enhance the wearer’s performance during exercise and to improve the recovery rate post exercise. For optimum results, we recommend wearing your fleece for at least 30 minutes prior to exercise, during your workout, and for at least one hour after exercise.
Fabric & Care
FABRIC COMPOSITION
- 50% KYnergy Infracycle Polyester
- 42% Recycled Polyester
- 8% Spandex
CARE INSTRUCTIONS
- Wash at 30C/86F
- Do not tumble dry
Reviews
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
The science inside KYMIRA’s infrared performance baselayers
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.
How it works
From body heat to biological signalling, the technology is designed to support the body throughout movement and recovery.
Nitric oxide activation
FIR exposure is linked to increased nitric oxide availability, promoting local vasodilation and improved micro-circulation.
Enhanced oxygen delivery
Independent tcPO₂ studies show that FIR garments raise tissue oxygenation, supporting aerobic energy pathways at a lower physiological cost.
Mitochondrial efficiency
FIR supports cellular energy and ATP production, helping sustain output and reduce the sensation of fatigue.
Biological signalling
Exercise studies show FIR garments activate signalling pathways related to mitochondrial biogenesis and angiogenesis.
Thermal balance
FIR helps stabilise micro-temperature during and after exercise, while the textile maintains breathability and moisture management.
Why it matters for performance
Designed to support sustained output, movement quality and rapid in-session recovery.
Power, strength & endurance
- Improved oxygen delivery and faster aerobic system activation.
- More efficient ATP production and reduced oxygen consumption requirements.
- Support for sustained intensity, total work output and neuromuscular efficiency.
Movement quality
- Enhanced local circulation and oxygenation help prime muscles for movement.
- Support for mobility, flexibility, control and stability during high-speed movements.
- Greater acute skeletal muscle adaptive responses during exercise.
Rapid in-session recovery
- Supports the removal of fatiguing metabolites produced during exercise.
- Helps moderate soreness and inflammatory responses.
- Supports repair between efforts and training sessions.
Why KYMIRA supports injury prevention
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.
Size guide
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.
Unisex sizes
| 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 |
Glove sizes
| 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 |
Women's sizes
| 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 |
Men's sizes
| 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" |
Trusted by elite athletes
to achieve
peak performance
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Frequently asked questions
Is my order tracked?
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.
How much is shipping and how long does it take?
We offer simple shipping options for all mainland UK orders:
• Running Vests:
- Standard Shipping (3–4 Calendar Days): FREE
- Expedited Shipping (1–2 Calendar Days): £4.99
• Enertor Insoles:
- Standard Shipping (3–4 Calendar Days): FREE
- Expedited Shipping (1–2 Calendar Days): £5.04
• Socks (Partner Fulfilled):
- Standard Shipping (3–5 Working Days): £2.99
- Express Shipping (Tracked: 2–3 Working Days): £4.99
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.
What is the return policy?
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.
I want to ask a question...
Head to our contact page here, fill in the form and we'll get back to you within 24 hours.
Built To Last
Comes with a 2-Year Run With Freedom® Guarantee
Free Standard Shipping
Automatically applied at checkout with no minimum order required.
500ml Flask Included
Every vest comes equipped with a premium, taste-neutral soft flask made from eco-friendly materials.
Light Weight & Adjustable
Adjustable side straps and front straps for a great fit.
Secure Storage
Zipped pockets hold large phones & keys.
Rain or Shine
Whatever The Weather, Challenger is Ready.
2-Year Run With Freedom® Guarantee
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.
Read more...*
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.