The fireproof Walero Long Sleeve Top is by far the most advanced in the industry.
This FIA and SFI approved top provides more comfort and protection for the wearer than any other product on the market. Using the same technology developed for NASA astronauts, the base layer of all Walero underwear actively stabilises body temperature of the wearer, regardless of the external climate.
Intelligent microcapsules, which can absorb and release thermal energy, are incorporated into the yarn before it’s woven. These help regulate the wearer’s body temperature at 37°C, by absorbing excess heat and only releasing it back to the wearer if they are below a certain temperature. Walero’s advanced microcapsules ensure the wearer is never too hot or too cold.
Featuring Envirotech+, a non-toxic, medical grade antimicrobial that is 99.9% effective against the majority of common bacteria, viruses and fungal spores, Walero underwear provides exceptional comfort and hygiene without compromises.
Approval:
- FIA 8856-2000 Approved
- SFI 3.3 Approved
Key Features:
- Protective Fireproof Construction
- Exceptional Breathability
- Advanced Temperature Regulation
- Ergonomic & Stylish Design
- Includes NASA Technology
- Enhanced Hygiene
Underwear is subject to special order conditions and non-returnable due to hygiene.
Have you written anything about this exact product?
Yes, we have covered this exact product: OMP KS Short Sleeve Top – Now Available In New Colours for 2025, and Walero In-Store Racewear Now On Sale. That is first-hand coverage from our own builds and showroom, not brochure copy.
Do I actually need FIA underwear?
If your championship requires it, this is the layer scrutineers ask about, and it is strongly recommended under any suit regardless. These tops are homologated to FIA 8856-2000, the previous FIA standard. Many championships still accept it, but check your regulations before buying for competition. They also carry SFI 3.3 approval. Our guide on whether fireproof underwear is mandatory covers the rules championship by championship.
What size should I go for?
Sizes run from XS to XXXL. Underwear layers should sit close to the skin without pinching, as loose fabric wrinkles under the suit and gets uncomfortable fast. Between sizes, take the smaller one for a base layer.
How do I wash it?
Underwear layers are the one bit of racewear you should wash after every use: cool and gentle, no bleach or fabric softener, air dry. That keeps the suit itself needing far fewer washes. Full routine in our racewear care guide.
