performance when it matters most
The Thermal Performance system trusted across Healthcare, Defense and Outdoor Recreation
PHYSICIAN-DESIGNED thermal PERFORMANCE SYSTEMS
The Foundational Thermal Performance Platform
HEATJAC CORE™ is the flagship wearable thermal management platform from HEATJAC, designed to help users remain comfortable, focused, and effective in demanding environments.
Originally developed by a physician to address thermal comfort challenges experienced by healthcare professionals working in cold operating rooms, HEATJAC CORE™ was created from a clinical understanding of how environmental conditions can affect comfort, concentration, and performance during long hours on the job.
Its patented wearable architecture provides a versatile foundation for multiple thermal management configurations without sacrificing mobility, fit, or comfort. Lightweight, low-profile, and designed for extended wear, HEATJAC CORE™ can be worn discreetly beneath scrubs, uniforms, workwear, tactical gear, or outdoor apparel.
Today, HEATJAC CORE™ is trusted across healthcare, industrial, commercial, outdoor, and recreational environments where maintaining comfort can directly impact performance, productivity, and endurance.
For applications requiring additional thermal support, HEATJAC CORE™ is compatible with optional heating and cooling accessories, allowing users to adapt to changing environmental conditions and personal comfort preferences while maintaining the same streamlined wearable platform.
Key Features
• Patented architecture. The Thermal Cell Array™ platform, protected by U.S. Patents 8,671,464 and 9,980,526.
• Configurable thermal zones. Position warmth (or cooling) where your work and environment demand it.
• Source-agnostic. Compatible with heating and cooling accessories and long-life warming elements. No proprietary battery lock-in.
• Ultra-low profile. Disappears under scrubs, uniforms, workwear, tactical gear, and outerwear.
• Lightweight and non-restrictive. Natural movement, all-day wear.
• Breathable mesh back panel. Sheds excess heat where the body needs it.
• Adjustable fit system. Secure across a wide range of body types. Sizes S/M and L/XL.
• Easy care. Built for repeated, real-world use. Follow the included care and fit guide.
Ideal Applications
Healthcare & Surgical Environments
Military & Defense Operations
Law Enforcement
First Responders
Industrial & Manufacturing Facilities
Warehousing & Logistics
Construction & Utilities
Outdoor Recreation
Hunting & Fishing
Hiking & Camping
Skiing & Snowboarding
Everyday Cold-Weather Use
What's Included
HEATJAC CORE™ Thermal Wearable Platform
Integrated Heat-Reflective Thermal Inserts
Adjustable Fit Harness System
Care & Fit Guide
Supplemental warming elements sold separately.
Warmth Without Bulk. Performance Without Compromise.
HEATJAC CORE™ delivers a smarter approach to thermal comfort by helping the body retain and utilize its own heat more efficiently. Whether you're standing through a lengthy procedure, operating in challenging conditions, working outdoors, or pursuing your next adventure, HEATJAC CORE™ provides the foundation for all-day thermal performance.
Reflect Heat. Retain Comfort.
The HEATJAC REFLECT™ vest is a lightweight thermal garment engineered to help your body retain warmth without the bulk of traditional insulated apparel. Utilizing HEATJAC's proprietary heat-reflective lining technology, REFLECT™ returns radiant body heat back toward the wearer, helping maintain comfort in cold environments while preserving mobility and freedom of movement.
Designed for healthcare professionals, outdoor enthusiasts, cold-sensitive individuals, and anyone who spends extended periods in challenging temperatures, REFLECT™ delivers practical warmth in a streamlined, low-profile design that layers comfortably beneath uniforms, scrubs, jackets, and everyday clothing.
Integrated warming pockets allow REFLECT™ to be paired with compatible long-duration warming elements (sold separately) for additional thermal support when conditions demand it.
Key Features
• Lining returns up to 95% of radiant body heat, based on material testing to ASTM C1371.
• Engineered heat-reflective thermal lining: warmth without insulation bulk.
• Lightweight, low-profile, designed for all-day wear.
• Integrated pockets for compatible warming elements.
• Snap-front closure; layers under scrubs, uniforms, workwear, and outerwear.
• Simple care: follow the included care guide (remove warming elements first).)
Designed for Healthcare Professionals
Operating rooms, imaging suites, emergency departments, and labs are kept cold by design. REFLECT™ helps the people working in them stay warm and comfortable through long shifts, with full mobility and nothing added over the uniform.
Designed for People Managing Cold-Sensitivity
Many people managing cold-sensitivity, including those living with Raynaud’s, look for simple, reliable ways to stay warm. REFLECT™ is designed to help reduce overall heat loss by reflecting body heat back toward the wearer, supporting core warmth without heavy layers, in cold offices, hospitals, air-conditioned spaces, and winter conditions.
REFLECT™ is a comfort product, not a medical device, and is not intended to diagnose, treat, cure, or prevent any disease or condition.
thermal performance
redefined
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Developed by an anesthesiologist and inventor to solve real-world thermal comfort challenges in demanding professional environments.
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A proprietary wearable platform engineered to deliver thermal performance without compromising mobility, comfort, or fit.
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Designed to support long-duration warming solutions for cold environments, extended shifts, and outdoor conditions.
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Compatible with cooling configurations that help manage heat and improve comfort in warm or high-temperature environments.
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Worn discreetly beneath uniforms, workwear, tactical gear, scrubs, or outdoor apparel without added bulk.
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Built for healthcare, industrial, tactical, commercial, and recreational applications where comfort can impact performance.
Meet the Founder
HEATJAC wasn't invented in the outdoor industry. It was born in medicine.
HEATJAC was founded by Dr. Mark Silverberg, DDS, MD, a physician, anesthesiologist, inventor, and healthcare innovator whose career focused on patient care, procedural excellence, and solving real-world challenges in demanding environments.
After decades in operating rooms where temperature and comfort directly impact performance, recovery, and outcomes, Dr. Silverberg recognized a problem that traditional apparel and thermal solutions had never solved. The result was HEATJAC—a patented wearable thermal performance system designed to help users maintain comfort without bulk, restriction, or compromise. Originally developed to support warmth in cold operating room environments, the platform's versatile architecture also enables cooling configurations for applications where heat management is equally important.
Today, that same physician-driven innovation extends beyond healthcare into industrial, tactical, commercial, outdoor, and consumer applications, bringing medical-grade thermal management to the people who depend on comfort, focus, and performance in demanding environments. Whether supporting warmth in cold conditions or cooling in challenging heat, HEATJAC was designed around a simple principle: helping people perform at their best when temperature matters.
Because when a thermal solution is developed by a doctor instead of a clothing company, it starts from a fundamentally different place.
trusted where failure isn’t an option.
HEATJAC was born in healthcare—an environment where precision, performance, and reliability matter every day. That same philosophy now extends across professional, industrial, and outdoor applications, delivering thermal solutions designed to help people stay focused, comfortable, and prepared when conditions are at their toughest.
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