Recovery apparel: which tests back compression and far-infrared claims

Three claims, three kinds of evidence

Recovery apparel copy usually blends three different statements. “Graduated compression” describes what the garment does at the skin: a pressure, which a laboratory can measure. “Far-infrared fabric” describes a property of the textile: how strongly it emits in the far-infrared band and how fast it warms under an infrared source, which a laboratory can also measure. “Recovers faster”, “reduces muscle soreness” and “improves circulation” describe what happens inside the wearer, and only a study of people can show that.

The distinction matters because evidence does not travel upward. A pressure report does not show that the pressure helps recovery, and an emissivity report does not show that the radiation reaches muscle or changes anything there. Write each claim at the level its evidence supports, and the copy, the test plan and the regulatory risk all become easier to manage.

Compression: measure pressure in mmHg, on the garment

Compression is the pressure a garment exerts on the skin, reported in millimetres of mercury; 1 mmHg is about 0.133 kPa. There are three ways to get the number: calculate it from the fabric's tension and the limb's radius using Laplace's law, measure it on a leg form or mannequin fitted with sensors, or measure it on a person with thin air-filled, fluid-filled, piezoresistive or capacitive sensors under the garment [6]. Fabric tests such as ASTM D4964 and ISO 20932-1 measure how the fabric stretches and pulls back; they are useful in development, but they are not a garment pressure [7][8].

Medical compression has standards of its own, such as Germany's RAL-GZ 387/1 and the European method report CEN/TR 15831:2009 [9][10]. Sports compression has no internationally agreed method, a gap the research literature points out [11]. China's FZ/T 70015-2022 sets a method for the pressure of knitted tight-fitting clothes, measured on a mannequin, and is the closest published reference for activewear [12]. Because no single method can be assumed, the method belongs in the order.

Pressure also depends on fit. In one study, 50 active adults were sized with the garment makers' own size guides, and many may not have received adequate pressure [13]. A pressure claim is therefore a claim about a size on a body shape, and the report has to say which.

Far-infrared fabric: what GB/T 30127-2013 measures

China's GB/T 30127-2013, Textiles — Testing and evaluation for far infrared radiation properties, is a recommended national standard in force since December 2014 [1]. It covers fibres, yarns, fabrics, nonwovens and their products, and it runs two tests. The emissivity test compares the specimen's far-infrared output with a standard blackbody plate at the same temperature on a 34 °C hot plate, read in the 5–14 µm band. The temperature-rise test places the specimen 500 mm from a 150 W infrared source and records how much its surface warms within 30 seconds [2][3].

A fabric passes only when both results clear the line: emissivity of at least 0.88 and a temperature rise of at least 1.4 °C for ordinary knitted and woven fabrics, and at least 0.83 and 1.7 °C for nonwovens and raised or pile fabrics. Fibres and yarns are measured but not graded [3][4]. The standard allows specimens to be washed first, using the GB/T 8629 domestic washing procedure, and suggests at least 30 washes for garments worn next to the skin and 10 for outerwear [2]. Ask for washed results: a finish that fades in the first month is not a property of the product you sell.

As of October 2026 we found no ISO, ASTM or JIS method written specifically for far-infrared textiles. Other markets rely on industry-scheme methods with their own thresholds and wavelength bands, so ask which method produced any far-infrared figure a supplier quotes.

What a far-infrared pass does not prove

A pass describes the fabric under laboratory conditions, and the conditions are generous. The 150 W lamp delivers far more infrared energy than a body passes to its clothing, and a 2026 study found that most samples, with or without far-infrared additives, warmed by more than 2 °C within 30 seconds, which limits how much the temperature-rise criterion separates them [3].

Emissivity alone does not prove an additive either. In a 2018 study, an ordinary nylon fabric measured 86.72% emissivity with a 1.52 °C rise, and changing only the fibre's cross-section, with no mineral added, raised emissivity to 91.85% [4]. A report shows that the fabric met the thresholds; it does not show what is in the yarn, and it says nothing about the wearer. GB/T 30127 itself states that it does not evaluate medical effects [2].

In practice: test the finished fabric rather than relying on an additive supplier's data sheet, test after the number of washes your care label implies, keep each report with the fabric lot it describes, and ask the mill to declare any additive in writing if you intend to name it.

Physiological claims need trials on people

For compression, the evidence is real but modest. A 2017 meta-analysis of 23 studies found small, very likely benefits for recovery, largest for the recovery of strength at 2–8 hours and after 24 hours, mainly after resistance exercise; it could not say how much pressure is needed, because few studies reported it [5]. A later scoping review of 183 studies found effects on performance equivocal, with possible reductions in muscle soreness, and asked researchers to report pressure at several sites [14].

For far-infrared garments, the evidence is thin. The only systematic review we found covered 11 studies of 5 to 22 participants each, too varied to pool, and called the results inconclusive, with possible effects on body temperature and blood flow; only 4 of the 11 reported clearly what the garment was made of or how much it emitted [15]. In a double-blind, placebo-controlled trial with 21 elite football players, far-infrared garments made no difference to jump height or strength [16], and in a trial with 25 players neither far-infrared garments nor cold-water immersion improved recovery after a match [17].

So “speeds up recovery” needs studies of the product itself, on people like the ones who will wear it, measuring the outcome the claim names, such as soreness or strength, against a control garment. Studies of a different garment, of people at rest or of animals do not transfer.

What regulators expect before “recovery” goes on the label

United States. The FTC's Health Products Compliance Guidance (2022) applies to health claims for any product: claims need competent and reliable scientific evidence, and for health benefits the FTC generally expects high-quality randomised, controlled human clinical trials [18]. Separately, a product intended to treat, mitigate or prevent disease, or to affect the structure or function of the body, is a medical device under the Federal Food, Drug, and Cosmetic Act; FDA's General Wellness guidance covers only low-risk products making wellness claims, and being covered does not establish that a product works [19][20].

European Union. A product with a medical purpose is a device under Regulation (EU) 2017/745, and its intended purpose is read from the label, the instructions and the promotional or sales material, so recovery copy can pull a garment into device rules [21]. The Unfair Commercial Practices Directive lists falsely claiming that a product can cure illnesses, dysfunction or malformations as unfair in all circumstances [22].

United Kingdom. The advertising code requires documentary evidence for claims consumers would take as objective, and evidence from trials on people where relevant; medical claims are reserved for products with the required device marking [23][24]. The ASA has upheld complaints against far-infrared sleepwear sold to help wearers recover faster (2019), against a far-infrared compression top said to be proven to improve strength and endurance (2020), and against recovery compression tights whose soreness, swelling and circulation claims were treated as medical claims (2025).

China. Under Article 17 of the Advertising Law, only advertisements for medical services, drugs and medical devices may refer to treating disease or use medical terms. GB/T 30127 is a voluntary test method; a pass does not license health claims. This is general information, not legal advice.

How to write the claim into the order

Decide the wording before sampling, then test to it. For compression, put the target in the order as a pressure range in mmHg for each size at named points, with the method and the number of washes before testing. For far-infrared fabric, name GB/T 30127-2013 or the method your market recognises, the category threshold, the washing procedure and count, and one report per fabric lot.

Wording that stays inside the evidence describes the garment, not the body: a stated pressure range at the calf for each size, measured on a leg form after a stated number of washes, or a fabric that meets the GB/T 30127-2013 far-infrared criteria after 30 washes. Wording such as “boosts recovery”, “improves circulation” or “reduces swelling” needs your own human trials and, in some markets, device approval. Without both, leave it off the hangtag.