Heat Sleeve- Closed Seam

Constructed with a heavy-duty aluminum laminated outer layer and an inner fiberglass insulation core, these sleeves provide robust heat protection while maintaining flexibility. Kool Wrap closed seam sleeves are available in multiple designs, including stitched seam, seamless, and silicone-coated fire-resistant sleeves, each tailored to specific performance and installation needs. 

Why Choose a Closed Seam Heat Sleeve?

Closed seam sleeves are best used when the component—such as a hose or cable—can be disconnected at one end and threaded through the sleeve. This design offers a fully enclosed insulation barrier, delivering more comprehensive protection from radiant and conductive heat. 

Kool Wrap closed seam sleeves are suitable for: 

• Automotive engine bays and turbo installations 
• High-performance or motorsport applications 
• Marine and off-road vehicles 
• Industrial equipment and power generation systems 
• Electrical cabinets and control wiring insulation 

By using a durable heat sleeve, you protect critical systems from heat damage, reduce the risk of component failure, and help maintain performance under extreme conditions. 

Product Construction and Materials 

Kool Wrap closed seam sleeves are built with high-grade materials designed for thermal stability and mechanical durability. 

Stitched Seam Sleeves: 

• Aluminium foil exterior reflects radiant heat 
• Fibreglass inner layer provides thermal insulation 
• Kevlar-stitched seam for durability and flexibility 
• Trim-to-fit with scissors for easy installation 

Ideal when flexibility is important, these sleeves work well around curved surfaces, bends, and tight spaces. 

Seamless Aluminum Sleeves: 

• Heavier-duty structure with no seam for maximum thermal coverage 
• Designed for high-vibration or high-friction environments 
• Rigid form holds shape around pipes and wires 
• Perfect for straight runs or areas where a tougher barrier is needed without seam exposure. 

Silicone-Coated Fire Sleeves: 

• Silver silicone outer layer is flame-resistant and liquid-resistant 
• Inner fibreglass insulation shields from continuous heat exposure 
• Excellent for use around hot fluid lines, oil systems, or exposed cables 
• Available in sizes up to 30mm internal diameter and 20-metre rolls 

These are the sleeves of choice in extreme heat or fluid-intensive environments. 

Features and Benefits 

Kool Wrap closed seam heat sleeves provide reliable protection across a variety of vehicles and equipment types. Key features include: 

• High-temperature resistance for both intermittent and continuous heat exposure 
• Reflective aluminium exterior deflects radiant heat from exhausts or turbo manifolds 
• Fibreglass core insulates components from temperature fluctuations 
• Kevlar or seamless construction ensures long-lasting durability under stress 
• Flexible and lightweight for easy routing and fitment 
• Cut-to-length convenience for fast, tailored installations 
• Multiple diameters and lengths to suit everything from sensor wires to coolant hoses 

These sleeves help prolong the life of vital systems and reduce downtime or maintenance costs in high-heat conditions. 

Suitable Applications 

Kool Wrap closed seam sleeves are trusted across numerous industries and performance environments: 

• Performance street vehicles and turbocharged engines 
• Race cars and drift vehicles exposed to elevated engine bay temperatures 
• 4WDs and off-road builds where hoses are routed near exhausts 
• Boats and marine engines requiring corrosion and heat resistance 
• Factory machinery or power systems with exposed cables and hydraulic lines 
• Electric and hybrid vehicles requiring high-voltage cable insulation 

By using the right thermal sleeve, you can avoid the heat-related failures common in under-bonnet environments, confined engine compartments, and industrial systems under continuous operation. 

Trusted Quality Backed by Experience

With over 20 years of expertise in automotive and industrial heat protection, Kool Wrap designs products that meet the demands of both professionals and enthusiasts. Our closed seam heat sleeves are part of a complete range of high-performance thermal solutions, including turbo blankets, spark plug boot shields, and exhaust wraps. 

Each product is tested for resistance to abrasion, heat cycling, and real-world mechanical stress—ensuring it performs as expected in the toughest conditions.

A Complete Thermal Solution for Your Build

Whether you’re managing heat in a custom engine swap, upgrading components in your 4WD, or insulating industrial wiring, Kool Wrap closed seam sleeves offer premium protection and clean installation. Choose between stitched, seamless, and silicone-coated versions to suit your specific temperature, flexibility, and durability requirements. 

Engineered for reliability, performance, and safety—Kool Wrap sleeves are the professional choice for heat management.