What Is Grade 5A Antibacterial Fabric?

Grade 5A is a top-tier antibacterial rating for textiles — a manufacturer's certification that a fabric inhibits the growth of common odour-causing bacteria to the highest standard. In practice it signals an antibacterial performance of roughly 99% or higher bacterial reduction when tested against organisms such as Staphylococcus aureus, E. coli and Klebsiella pneumoniae.

Antibacterial fabrics are measured by recognised laboratory standards — ISO 20743, AATCC 100 and China's GB/T 20944 — which incubate bacteria on the fabric and calculate the percentage killed or stopped from multiplying over an 18–24 hour period. A "5A" grade sits at the top of that scale. SALIGIA's Anaerobic Club range is made from a 5A-grade antibacterial nylon-spandex.

How Antibacterial Underwear Actually Works

Sweat itself is almost odourless. The smell we associate with a hard workout is produced when bacteria on the skin feed on that sweat and release waste compounds. Warm, damp, enclosed areas — exactly where underwear sits — are where they thrive.

Antibacterial fabric interrupts that cycle. By inhibiting bacterial growth on the fabric, there are fewer microbes to break sweat down, so far less odour develops in the first place. Combined with a nylon's natural moisture-wicking, the fabric stays drier and fresher for longer — meaning you can train harder, wear it longer and wash it less.

Grade 5A reflects the manufacturer's stated antibacterial certification. Antibacterial finishes reduce odour-causing bacteria on the fabric; they are a freshness and hygiene feature, not a medical device or a substitute for washing.

The Anaerobic Club Difference

Antibacterial nylon-spandex

The 5A-grade antibacterial nylon is soft to the touch with excellent moisture absorption, so you stay dry through high-intensity training. The nylon construction is also more abrasion-resistant and harder-wearing than cotton — it keeps its shape and looks like new wash after wash.

Engineered fit, less friction

The athletic brief cut follows the body's lines to provide support and reduce friction during exercise, while a smooth crotch construction minimises skin irritation on long sessions. Close-fitting, but with full freedom to move.

No VPL, all-day comfort

An elastic, low-profile waistband holds everything in place and helps prevent visible lines under clothing — discreet enough for a suit, engineered enough for the squat rack.

Not Just for the Gym

The same properties that make Anaerobic Club ideal for training make it a smart everyday choice. In summer, the antibacterial finish and fast-drying nylon keep sweat from turning into odour. In winter, the close-fitting layer keeps you dry and comfortable under heavier clothing. The minimalist design works under anything — from gym shorts to tailoring.

Antibacterial Underwear FAQs