FR Long Sleeve Base Layer T-Shirt — The Layer That Matters Most
Your outer FR shirt is doing its job. This is what protects you underneath it.
When arc flash or flash fire occurs, non-FR synthetic base layers — polyester, nylon, spandex — melt against skin, turning a survivable incident into a catastrophic burn injury. The fix is simple: an FR base layer that performs at the skin level, so every layer in your system is working for you, not against you.
Built from 5 oz FR modacrylic blend — the preferred base-layer fiber for FR workwear — it's lightweight, soft, and moisture-wicking enough to wear comfortably all day, with a 6 cal/cm² arc rating (ATPV) — CAT 1 that meets ASTM F1506. Thin enough to disappear under your work shirt. Warm enough to extend your season. Protective enough to complete your system.
Features:
- 6 cal/cm² arc rating (ATPV) — CAT 1, meets ASTM F1506
- 5 oz FR modacrylic blend — inherent FR, lightweight, moisture-wicking
- Long sleeve — full arm coverage for complete layered protection
- Tagless, flatlock seams — worn against skin all day, no irritation
- Gray — pairs under any FR uniform shirt or henley
-
Orange — visible FR base layer for traffic exposure and emergency response
- Sizes S–5XL in both colors
Layering tip: pair with our FR Henley (8.7 cal) or FR Zip Hoodie (22 cal) for a fully compliant FR layered system from skin to outer layer. Prefer short sleeves for hot-weather work? See the FR Short Sleeve Base Layer T-Shirt →
Backed by our Tough As You Guarantee.
