FIR Technology: The Science of Far Infrared
Far Infrared technology lets a fabric reflect your own body heat back to you, delivering more warmth without more bulk. This chapter explains what Far Infrared actually is, why titanium is the carrier material, and the four benefits FIR delivers beyond simple insulation. By the end you will understand why T2 Chillproof delivers warmth equivalent to a 4 to 5 mm wetsuit from a fabric that weighs almost nothing and adds zero buoyancy.
The problem with adding more
The traditional logic of thermal protection is simple. More warmth means more material. It makes intuitive sense, and it is also a ceiling, because more material means more bulk, more buoyancy and more lead for divers. FIR technology challenges that assumption at its foundation. It does not add warmth by adding material. It improves the efficiency with which the body uses the warmth it already generates. The result is more warmth, with no additional bulk and no additional trade offs.
What Far Infrared actually is
Far Infrared is a band of electromagnetic energy on the light spectrum, beyond visible light, at wavelengths between roughly 6 and 14 microns. The human body continuously emits infrared energy as a byproduct of metabolism, radiating heat outward as electromagnetic waves rather than only through conduction, convection or evaporation. Under normal circumstances most of that energy is simply lost to the surrounding environment.
FIR technology intercepts that process. Titanium nanoparticles permanently embedded in the fabric absorb the body's own infrared energy as it radiates outward, then re-emit it back toward the body at wavelengths the body can absorb and use, primarily in the far infrared range where it is most receptive. You are not receiving external warmth. You are receiving your own warmth back, more efficiently, with less loss.
Why titanium
The choice of titanium is not arbitrary. It is a highly effective emitter and reflector of far infrared radiation, and in nanoparticle form it maximises the surface area available for that exchange, so more energy is captured and re-emitted. The particles are permanently embedded in the fabric during manufacturing. Not a coating applied to the surface, not a treatment that washes out over time, but part of the fabric structure itself, which is why the effect lasts across the life of the garment and sits behind the Sharkskin two year performance guarantee.
The four benefits of FIR technology
FIR does not simply add warmth. It delivers four distinct benefits at once.
1. Improved thermal efficiency
The body's own infrared energy is reflected back rather than lost, so it maintains its thermal state with less metabolic effort. In T2 Chillproof this produces warmth equivalent to a 4 to 5 mm wetsuit, where the underlying three layer Chillproof architecture alone produces 2 to 3 mm equivalent warmth. The FIR adds the rest without a single additional layer.
2. Improved circulation
Far infrared at the wavelengths re-emitted by titanium nanoparticles has been shown to penetrate just below the skin surface and encourage gentle vasodilation, the expansion of blood vessels, which supports microcirculation and blood flow to the extremities. This matters in the water, because cold and wind cause the opposite, vasoconstriction, which narrows the vessels in the hands and feet to protect the core and reduces dexterity. FIR works against that process, so dexterity is preserved longer into cold conditions and fatigue in the extremities is delayed.
3. Enhanced recovery
Improved circulation supports faster clearance of the metabolic by products of effort from the muscles, which means faster recovery. Between sprint intervals, between wave sets, between rescue operations and between dive sessions, the speed of recovery determines the quality of the next effort. The R-Series Compression range, which uses liquid titanium FIR alongside structural compression, was built for exactly this.
4. Permanent antimicrobial protection
Titanium nanoparticles carry inherent antimicrobial properties that inhibit the bacteria responsible for odour and garment breakdown. The effect is permanent, embedded in the fabric rather than applied as a treatment, so across multi day diving, paddling expeditions or extended patrols the garment stays fresher for longer and lasts longer.
The difference between Chillproof and T2 Chillproof
This is the most common question in the range, and the answer is one thing. The architecture of both is identical at the three layer level, a DWR nylon outer, a 100% windproof breathable membrane and a hollow yarn fleece inner. Chillproof on its own delivers warmth equivalent to a 2 to 3 mm wetsuit. T2 Chillproof is the same architecture with titanium FIR nanoparticles in the inner fleece, which lifts the thermal output by the equivalent of two millimetres of neoprene, without adding a single millimetre of thickness or buoyancy, and adds the circulation, recovery and antimicrobial benefits on top.
Choose Chillproof for temperate conditions, recreational use and a tighter budget. Choose T2 for cold water, extended exposure, high performance demand and when recovery is valued. Both are correct for the right user in the right conditions, and for a full product by product comparison see our guide on which Sharkskin is best.
Eighteen world records of evidence
There are research papers and laboratory measurements on FIR garments, and then there is Damien Rider. A man who paddled 800 kilometres from the Gold Coast to Bondi, skateboarded 4,000 kilometres across America including 24 hours non stop through 55 degree desert heat, and paddled 480 kilometres across nine Maldives atolls to the equator. Across every one of these challenges, Sharkskin FIR, primarily the R-Series Compression range, was the recovery tool he relied on between efforts, and he states openly he could not complete them without it.
That is not a testimonial about comfort. It is a performance record about recovery, the ability to absorb extreme effort and return to full capacity fast enough to do it again, expressed across the most extreme conditions in the record books. Eighteen world records, one consistent variable.
What users actually experience
The science is real, and the experience it produces is consistently reported. Divers notice their hands keep dexterity longer in cold water in T2, the improved circulation felt before it is understood. Paddlers and swimmers notice they warm up faster after a cold water exit, the body receiving its own heat back rather than losing it. Endurance athletes notice recovery improvement between sessions, measurable and consistent across sustained training loads. And professional users notice garments stay fresher across multi day deployments, the antimicrobial benefit turning into a practical operational advantage. These are not isolated anecdotes, they are consistent across thousands of five star reviews collected over years.
Why FIR is a long-term differentiator
Most fabric technologies can be copied. Construction techniques can be replicated and design elements adapted. A permanently integrated titanium nanoparticle FIR system is not a surface treatment that can be matched by adopting a similar look, it requires specific material science, manufacturing processes and quality control across every production run. Sharkskin has been building garments with FIR for years, and that accumulated knowledge is a durable advantage, not just a current one. How it fits the wider system is set out in S.A.L.T., and the science it serves is in Thermoregulation.
