Men's Infrared Merino Baselayer Top
Men's Infrared Merino Baselayer Top
A premium cold‑weather performance and recovery baselayer made from soft knitted merino wool and KYMIRA® infrared technology. Features cooling zones, adaptive stretch panels, quick-dry breathability and a body-hugging fit — perfect for athletes, hikers and winter wellness enthusiasts . . .
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Colour
Payment options available.
Easy returns.
Payment options available.
Easy returns.
KYMIRA Infrared Merino Baselayer & Light Knit
The KYMIRA® Infrared Merino Baselayer is our most advanced cold‑weather performance and recovery layer — now engineered with a heavier, soft knitted 3D Merino construction, expanded cooling ventilation zones, and ergonomic stretch panels for the perfect body‑hugging fit. Sustainably sourced merino wool meets KYMIRA’s patented infrared technology to deliver elite‑level thermoregulation, circulation‑boosting benefits, and all‑day comfort.
Infrared fibres increase warmth retention by up to 63% while improving microcirculation, oxygenation and tissue readiness through nitric‑oxide‑driven vasodilation.
Merino wool wicks moisture rapidly, resists odour naturally, and maintains thermal balance across extreme conditions from −35ºC to +48ºC.
Combined with its breathable, quick‑drying knit, flattering rib detail, and adaptive side and arm paneling, this is the most versatile baselayer for winter sport, outdoor exploration, and restorative recovery wear.
Use Cases
Cold-Weather Performance Layer
Perfect for:
- Skiing, snowboarding & winter endurance running
- Alpine hikes, trekking & cold-weather fastpacking
- Rugby, football & pitch‑side warm-ups in freezing conditions
Infrared fibres help muscles warm up faster and maintain responsiveness, reducing injury risk in winter conditions.
Expedition, Hiking & Outdoor Adventure
- Breathable cooling zones regulate temperature during climbs and descents
- Quick-drying, odour‑resistant merino ideal for multi‑day treks
- Infrared increases circulation at altitude, helping with energy and warmth management
Recovery & Wellness Wear
- Soft, body‑hugging comfort for post-training wear
- Infrared technology enhances recovery, accelerating neuromuscular restoration within 24–48 hours
- Ideal for downtime, commuting, travel stiffness reduction, or low‑intensity movement
Lifestyle & Winter Leisurewear
- Works as a lightweight jumper alternative
- Stylish ribbed detailing at the neck and shoulders
- Warm, breathable, and elegant for everyday winter wear
Infrared Technology Benefits
- Improves microcirculation & oxygen delivery (NO-mediated vasodilation)
- Supports faster recovery & reduced soreness (clinically shown at 24–48h)
- Enhances endurance, tissue oxygenation & warmth retention up to 63%
- SPF35+ protective and antimicrobial mineral blend reduces odour build-up
Merino Wool Benefits
- Naturally temperature-regulating and odour-resistant
- Soft next-to-skin feel
- Durable and ideal for multi‑day adventures
- Sustainable, renewable fibre source
Who It’s For
- Outdoor athletes & winter sports performers
- Hikers, trekkers & mountain endurance enthusiasts
- Commuters, travellers & anyone wanting superior cold‑weather comfort
- Those wanting a premium, soft, body-contouring merino baselayer with scientific performance
- Wellness-conscious individuals seeking circulation & recovery benefits
- Those managing health and rehabilitation conditions and want the benefits of infrared in a soft merino fabric
Key Features
Performance + Comfort
- Thermoregulating cooling zones to maintain perfect temperature during any activity
- Expandable side & arm panels for adaptive stretch and ergonomic fit
- Breathable & quick‑drying soft merino knit for moisture management
- Designed to hug the body comfortably without restriction
- 3D seamless construction for friction‑free movement
- Flattering rib details at the neck & shoulders
- Wear-alone or layering versatility for winter training or daily comfort
Protocols:
Warm‑Up:
Wear 15–20 mins before activity to boost circulation, warm muscles quicker, and reduce cold‑weather injury risk.
Performance:
Wear throughout training for enhanced oxygenation, thermoregulation and endurance. Works in −35°C to +48°C environments.
Cold Weather Outdoors:
Use as a next‑to‑skin winter layer for skiing, hiking, trekking, mountaineering. Retains warmth 63% better and dries 65% faster to prevent chill.
Recovery:
Wear 1–2 hrs post‑training or in the evening to accelerate neuromuscular recovery (clinically improved at 24–48h).
Travel & Daily Wellness:
Wear during long flights, commutes or sitting periods for improved microcirculation and reduced stiffness.
Multi‑Day Adventures:
Merino + infrared allows multi‑day wear, naturally odor‑resistant and thermoregulating. Ideal for trekking and overnight expeditions
The Science Inside KYMIRA Infrared
What it is
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, a wavelength shown in clinical literature to penetrate tissue and stimulate beneficial biological responses that support circulation, oxygenation, energy production, and recovery.
How it works (step by step the headlines)
1. Energy conversion: Body heat → absorbed by mineral matrix → re emitted as FIR (6–14 µm).
2. Nitric Oxide Activation → Vasodilation
FIR exposure is linked to increased nitric oxide availability, promoting local vasodilation and improved micro circulation.
3. Enhanced Oxygen Delivery (tcPO₂)
Independent tcPO₂ studies show that FIR garments raise tissue oxygenation, supporting aerobic energy pathways at a lower physiological cost.
4. Mitochondrial efficiency: FIR accelerates cellular energy (ATP) production, aiding sustained output and reduced fatigue.
5. Improved Biological Signalling (Adaptation Support): Exercise studies show FIR garments activate signalling pathways related to mitochondrial biogenesis and angiogenesis
6. Thermal Comfort & Temperature Balance
FIR helps stabilise micro temperature during and after exercise, while the textile maintains breathability and moisture management.
And more...
Why it matters for performance
- Increased Power, Strength & Endurance Capacity
Improved oxygen delivery, faster aerobic system activation, and more efficient ATP energy production, combined with reduced oxygen consumption requirements, support higher sustained intensities and greater total work output, increased average power, stronger muscles, better neuromuscular efficiency, increased explosive power, coordination. In clinical trials by the University of Loughborough, wearing KYMIRA Infrared has been shown to improve athletic performance by up to 8.7% from first wear.
- Better Movement Quality & Soft Tissue Readiness
Enhanced local circulation and oxygenation help prime muscles to be stronger and more flexible, improving mobility, reducing stiffness, and supporting more consistent movement patterns during sessions. Clinical trials show users have better control and stability during high-speed movements, alongside increased jump height and grip strength.
Greater acute skeletal muscle adaptive responses during exercise, with increased mitochondrial and angiogenic signalling. Leading to quicker training adaptions biologically.
- Rapid in-session recovery: The same mechanisms support repair — removing waste products like lactic acid quicker, reducing muscle micro-tears that create DOMS, reducing in-session fatiguing and inflammation marker metabolites, and activating the pain and inflammation modulating pathways, reducing feelings of soreness.
Why KYMIRA Supports Injury Prevention
Enhanced local circulation and oxygenation help prime muscles to be stronger and more flexible, improving mobility, reducing stiffness, and supporting more consistent movement patterns during sessions. Clinical trials show users have better control and stability during high-speed movements. This prevents the creation of micro muscle tears that contribute to DOMS, and to larger soft-tissue injuries.
- Improved oxygenation supports efficient muscular contraction and reduces fatigue related injury risk.
- Cellular energy support (enhanced energy ATP production), reduced aerobic pathway and oxygen use, greater endurance and reductions in fatiguing metabolites in session, supports stable movement patterns and reduces compensatory mechanics from tiredness.
- Temperature regulation helps prevent cold related tightness and maintains muscle compliance.
- Accelerated recovery mechanisms, reductions in fatiguing metabolites, and reductions in inflammatory markers during and between sessions, reduce cumulative tissue stress experienced in session.
Increased angiogenic signalling and mitochondrial angiogenesis support quicker training adaptions for safer movements.
Why it matters for recovery
- Faster post exertion neuromuscular restoration & readiness
Peer reviewed athlete research shows that recovering in KYMIRA FIR garments can deliver highly significant neuromuscular recovery improvements at 24–48 h, compared to placebo. Objective markers of readiness to perform again after the prior session, show next athletic performance is significantly better following recovery in KYMIRA Infrared. Wearers are in a better biological state and have reduced physiological stress in objective measures.
- Reduced feelings of DOMS, soreness and inflammation.
Peer-reviewed research shows using KYMIRA Infrared significantly reduces athletes experiences of DOMS, and modulates pain relief and anti-inflammatory pathways, actively reducing both, with natural effects.
Passive, non powered recovery you can wear immediately after training, during travel, and overnight—no settings, no sessions to book—drives consistent use and better outcomes.
- Increased Circulation, Oxygenation & Quicker soft-tissue Repair
The observed tcPO₂ rise within 30–90 min aligns with the post session window when tissues need oxygen for remodelling and waste clearance, supporting reduced next day heaviness and smoother movement quality. This acceleration of recovery processes, continues as long sa your wear KYMIRA.
- Acute Skeletal Muscle Adaptive Responses During Recovery
Clinical studies show significantly increased mitochondrial and angiogenic signalling showing increased angiogenesis, neuromuscular training adaption results.
Learn more in our Science area
Model is wearing: Size Large
Model's height: 188cm / 6'2''
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”
Full size chart available in the footer.
FABRIC COMPOSITION
100% Infracycle™ Merino Wool (sustainably sourced)
CARE INSTRUCTIONS
Hand Wash
Do not tumble dry
KYMIRA Infrared Merino Baselayer & Light Knit
The KYMIRA® Infrared Merino Baselayer is our most advanced cold‑weather performance and recovery layer — now engineered with a heavier, soft knitted 3D Merino construction, expanded cooling ventilation zones, and ergonomic stretch panels for the perfect body‑hugging fit. Sustainably sourced merino wool meets KYMIRA’s patented infrared technology to deliver elite‑level thermoregulation, circulation‑boosting benefits, and all‑day comfort.
Infrared fibres increase warmth retention by up to 63% while improving microcirculation, oxygenation and tissue readiness through nitric‑oxide‑driven vasodilation.
Merino wool wicks moisture rapidly, resists odour naturally, and maintains thermal balance across extreme conditions from −35ºC to +48ºC.
Combined with its breathable, quick‑drying knit, flattering rib detail, and adaptive side and arm paneling, this is the most versatile baselayer for winter sport, outdoor exploration, and restorative recovery wear.
Use Cases
Cold-Weather Performance Layer
Perfect for:
- Skiing, snowboarding & winter endurance running
- Alpine hikes, trekking & cold-weather fastpacking
- Rugby, football & pitch‑side warm-ups in freezing conditions
Infrared fibres help muscles warm up faster and maintain responsiveness, reducing injury risk in winter conditions.
Expedition, Hiking & Outdoor Adventure
- Breathable cooling zones regulate temperature during climbs and descents
- Quick-drying, odour‑resistant merino ideal for multi‑day treks
- Infrared increases circulation at altitude, helping with energy and warmth management
Recovery & Wellness Wear
- Soft, body‑hugging comfort for post-training wear
- Infrared technology enhances recovery, accelerating neuromuscular restoration within 24–48 hours
- Ideal for downtime, commuting, travel stiffness reduction, or low‑intensity movement
Lifestyle & Winter Leisurewear
- Works as a lightweight jumper alternative
- Stylish ribbed detailing at the neck and shoulders
- Warm, breathable, and elegant for everyday winter wear
Infrared Technology Benefits
- Improves microcirculation & oxygen delivery (NO-mediated vasodilation)
- Supports faster recovery & reduced soreness (clinically shown at 24–48h)
- Enhances endurance, tissue oxygenation & warmth retention up to 63%
- SPF35+ protective and antimicrobial mineral blend reduces odour build-up
Merino Wool Benefits
- Naturally temperature-regulating and odour-resistant
- Soft next-to-skin feel
- Durable and ideal for multi‑day adventures
- Sustainable, renewable fibre source
Who It’s For
- Outdoor athletes & winter sports performers
- Hikers, trekkers & mountain endurance enthusiasts
- Commuters, travellers & anyone wanting superior cold‑weather comfort
- Those wanting a premium, soft, body-contouring merino baselayer with scientific performance
- Wellness-conscious individuals seeking circulation & recovery benefits
- Those managing health and rehabilitation conditions and want the benefits of infrared in a soft merino fabric
Key Features
Performance + Comfort
- Thermoregulating cooling zones to maintain perfect temperature during any activity
- Expandable side & arm panels for adaptive stretch and ergonomic fit
- Breathable & quick‑drying soft merino knit for moisture management
- Designed to hug the body comfortably without restriction
- 3D seamless construction for friction‑free movement
- Flattering rib details at the neck & shoulders
- Wear-alone or layering versatility for winter training or daily comfort
Protocols:
Warm‑Up:
Wear 15–20 mins before activity to boost circulation, warm muscles quicker, and reduce cold‑weather injury risk.
Performance:
Wear throughout training for enhanced oxygenation, thermoregulation and endurance. Works in −35°C to +48°C environments.
Cold Weather Outdoors:
Use as a next‑to‑skin winter layer for skiing, hiking, trekking, mountaineering. Retains warmth 63% better and dries 65% faster to prevent chill.
Recovery:
Wear 1–2 hrs post‑training or in the evening to accelerate neuromuscular recovery (clinically improved at 24–48h).
Travel & Daily Wellness:
Wear during long flights, commutes or sitting periods for improved microcirculation and reduced stiffness.
Multi‑Day Adventures:
Merino + infrared allows multi‑day wear, naturally odor‑resistant and thermoregulating. Ideal for trekking and overnight expeditions
As Used In
“As a recovery protocol we have seen a 25% reduction in perceived pain… 33% reduction in stiffness…"
Bob Stewart
Head of Medical, International Rugby
“Since using KYMIRA I’ve noticed that I just haven’t been as sore… I’ve been waiting for the DOMS to hit but they just haven’t.”
Brinn Bevan
GB Olympic Gymnast
